/
Function.java
2267 lines (2185 loc) · 85.4 KB
/
Function.java
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/*
* Copyright 2004-2013 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.lealone.sql.expression.function;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.sql.Connection;
import java.sql.Date;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;
import java.util.regex.PatternSyntaxException;
import org.lealone.api.ErrorCode;
import org.lealone.common.compress.CompressTool;
import org.lealone.common.exceptions.DbException;
import org.lealone.common.security.BlockCipher;
import org.lealone.common.security.CipherFactory;
import org.lealone.common.security.SHA256;
import org.lealone.common.util.DataUtils;
import org.lealone.common.util.DateTimeUtils;
import org.lealone.common.util.JdbcUtils;
import org.lealone.common.util.MathUtils;
import org.lealone.common.util.New;
import org.lealone.common.util.StatementBuilder;
import org.lealone.common.util.StringUtils;
import org.lealone.common.util.Utils;
import org.lealone.db.Command;
import org.lealone.db.Constants;
import org.lealone.db.Csv;
import org.lealone.db.Database;
import org.lealone.db.Mode;
import org.lealone.db.ServerSession;
import org.lealone.db.expression.ExpressionVisitor;
import org.lealone.db.schema.Schema;
import org.lealone.db.schema.Sequence;
import org.lealone.db.service.ServiceExecuterManager;
import org.lealone.db.table.Column;
import org.lealone.db.table.ColumnResolver;
import org.lealone.db.table.Table;
import org.lealone.db.table.TableFilter;
import org.lealone.db.util.AutoCloseInputStream;
import org.lealone.db.value.DataType;
import org.lealone.db.value.Value;
import org.lealone.db.value.ValueArray;
import org.lealone.db.value.ValueBoolean;
import org.lealone.db.value.ValueBytes;
import org.lealone.db.value.ValueDate;
import org.lealone.db.value.ValueDouble;
import org.lealone.db.value.ValueInt;
import org.lealone.db.value.ValueLong;
import org.lealone.db.value.ValueNull;
import org.lealone.db.value.ValueResultSet;
import org.lealone.db.value.ValueString;
import org.lealone.db.value.ValueTime;
import org.lealone.db.value.ValueTimestamp;
import org.lealone.db.value.ValueUuid;
import org.lealone.sql.Parser;
import org.lealone.sql.expression.Expression;
import org.lealone.sql.expression.ExpressionColumn;
import org.lealone.sql.expression.SequenceValue;
import org.lealone.sql.expression.ValueExpression;
import org.lealone.sql.expression.Variable;
import org.lealone.storage.fs.FileUtils;
/**
* This class implements most built-in functions of this database.
*/
public class Function extends Expression implements FunctionCall {
public static final int ABS = 0, ACOS = 1, ASIN = 2, ATAN = 3, ATAN2 = 4, BITAND = 5, BITOR = 6, BITXOR = 7,
CEILING = 8, COS = 9, COT = 10, DEGREES = 11, EXP = 12, FLOOR = 13, LOG = 14, LOG10 = 15, MOD = 16, PI = 17,
POWER = 18, RADIANS = 19, RAND = 20, ROUND = 21, ROUNDMAGIC = 22, SIGN = 23, SIN = 24, SQRT = 25, TAN = 26,
TRUNCATE = 27, SECURE_RAND = 28, HASH = 29, ENCRYPT = 30, DECRYPT = 31, COMPRESS = 32, EXPAND = 33,
ZERO = 34, RANDOM_UUID = 35, COSH = 36, SINH = 37, TANH = 38, LN = 39;
public static final int ASCII = 50, BIT_LENGTH = 51, CHAR = 52, CHAR_LENGTH = 53, CONCAT = 54, DIFFERENCE = 55,
HEXTORAW = 56, INSERT = 57, INSTR = 58, LCASE = 59, LEFT = 60, LENGTH = 61, LOCATE = 62, LTRIM = 63,
OCTET_LENGTH = 64, RAWTOHEX = 65, REPEAT = 66, REPLACE = 67, RIGHT = 68, RTRIM = 69, SOUNDEX = 70,
SPACE = 71, SUBSTR = 72, SUBSTRING = 73, UCASE = 74, LOWER = 75, UPPER = 76, POSITION = 77, TRIM = 78,
STRINGENCODE = 79, STRINGDECODE = 80, STRINGTOUTF8 = 81, UTF8TOSTRING = 82, XMLATTR = 83, XMLNODE = 84,
XMLCOMMENT = 85, XMLCDATA = 86, XMLSTARTDOC = 87, XMLTEXT = 88, REGEXP_REPLACE = 89, RPAD = 90, LPAD = 91,
CONCAT_WS = 92;
public static final int CURDATE = 100, CURTIME = 101, DATE_ADD = 102, DATE_DIFF = 103, DAY_NAME = 104,
DAY_OF_MONTH = 105, DAY_OF_WEEK = 106, DAY_OF_YEAR = 107, HOUR = 108, MINUTE = 109, MONTH = 110,
MONTH_NAME = 111, NOW = 112, QUARTER = 113, SECOND = 114, WEEK = 115, YEAR = 116, CURRENT_DATE = 117,
CURRENT_TIME = 118, CURRENT_TIMESTAMP = 119, EXTRACT = 120, FORMATDATETIME = 121, PARSEDATETIME = 122,
ISO_YEAR = 123, ISO_WEEK = 124, ISO_DAY_OF_WEEK = 125;
public static final int DATABASE = 150, USER = 151, CURRENT_USER = 152, IDENTITY = 153, SCOPE_IDENTITY = 154,
AUTOCOMMIT = 155, READONLY = 156, DATABASE_PATH = 157, LOCK_TIMEOUT = 158, DISK_SPACE_USED = 159;
public static final int IFNULL = 200, CASEWHEN = 201, CONVERT = 202, CAST = 203, COALESCE = 204, NULLIF = 205,
CASE = 206, NEXTVAL = 207, CURRVAL = 208, ARRAY_GET = 209, CSVREAD = 210, CSVWRITE = 211, MEMORY_FREE = 212,
MEMORY_USED = 213, LOCK_MODE = 214, SCHEMA = 215, SESSION_ID = 216, ARRAY_LENGTH = 217, LINK_SCHEMA = 218,
GREATEST = 219, LEAST = 220, CANCEL_SESSION = 221, SET = 222, TABLE = 223, TABLE_DISTINCT = 224,
FILE_READ = 225, TRANSACTION_ID = 226, TRUNCATE_VALUE = 227, NVL2 = 228, DECODE = 229, ARRAY_CONTAINS = 230;
public static final int EXECUTE_SERVICE_NO_RETURN_VALUE = 500, EXECUTE_SERVICE_WITH_RETURN_VALUE = 501;
/**
* This is called LEALONE_VERSION() and not VERSION(), because we return a fake value
* for VERSION() when running under the PostgreSQL ODBC driver.
*/
public static final int LEALONE_VERSION = 231;
public static final int ROW_NUMBER = 300;
private static final int VAR_ARGS = -1;
private static final long PRECISION_UNKNOWN = -1;
private static final HashMap<String, FunctionInfo> FUNCTIONS = New.hashMap();
private static final HashMap<String, Integer> DATE_PART = New.hashMap();
private static final char[] SOUNDEX_INDEX = new char[128];
protected Expression[] args;
private final FunctionInfo info;
private ArrayList<Expression> varArgs;
private int dataType, scale;
private long precision = PRECISION_UNKNOWN;
private int displaySize;
private final Database database;
static {
// DATE_PART
DATE_PART.put("SQL_TSI_YEAR", Calendar.YEAR);
DATE_PART.put("YEAR", Calendar.YEAR);
DATE_PART.put("YYYY", Calendar.YEAR);
DATE_PART.put("YY", Calendar.YEAR);
DATE_PART.put("SQL_TSI_MONTH", Calendar.MONTH);
DATE_PART.put("MONTH", Calendar.MONTH);
DATE_PART.put("MM", Calendar.MONTH);
DATE_PART.put("M", Calendar.MONTH);
DATE_PART.put("SQL_TSI_WEEK", Calendar.WEEK_OF_YEAR);
DATE_PART.put("WW", Calendar.WEEK_OF_YEAR);
DATE_PART.put("WK", Calendar.WEEK_OF_YEAR);
DATE_PART.put("WEEK", Calendar.WEEK_OF_YEAR);
DATE_PART.put("DAY", Calendar.DAY_OF_MONTH);
DATE_PART.put("DD", Calendar.DAY_OF_MONTH);
DATE_PART.put("D", Calendar.DAY_OF_MONTH);
DATE_PART.put("SQL_TSI_DAY", Calendar.DAY_OF_MONTH);
DATE_PART.put("DAYOFYEAR", Calendar.DAY_OF_YEAR);
DATE_PART.put("DAY_OF_YEAR", Calendar.DAY_OF_YEAR);
DATE_PART.put("DY", Calendar.DAY_OF_YEAR);
DATE_PART.put("DOY", Calendar.DAY_OF_YEAR);
DATE_PART.put("SQL_TSI_HOUR", Calendar.HOUR_OF_DAY);
DATE_PART.put("HOUR", Calendar.HOUR_OF_DAY);
DATE_PART.put("HH", Calendar.HOUR_OF_DAY);
DATE_PART.put("SQL_TSI_MINUTE", Calendar.MINUTE);
DATE_PART.put("MINUTE", Calendar.MINUTE);
DATE_PART.put("MI", Calendar.MINUTE);
DATE_PART.put("N", Calendar.MINUTE);
DATE_PART.put("SQL_TSI_SECOND", Calendar.SECOND);
DATE_PART.put("SECOND", Calendar.SECOND);
DATE_PART.put("SS", Calendar.SECOND);
DATE_PART.put("S", Calendar.SECOND);
DATE_PART.put("MILLISECOND", Calendar.MILLISECOND);
DATE_PART.put("MS", Calendar.MILLISECOND);
// SOUNDEX_INDEX
String index = "7AEIOUY8HW1BFPV2CGJKQSXZ3DT4L5MN6R";
char number = 0;
for (int i = 0, length = index.length(); i < length; i++) {
char c = index.charAt(i);
if (c < '9') {
number = c;
} else {
SOUNDEX_INDEX[c] = number;
SOUNDEX_INDEX[Character.toLowerCase(c)] = number;
}
}
// FUNCTIONS
addFunction("ABS", ABS, 1, Value.NULL);
addFunction("ACOS", ACOS, 1, Value.DOUBLE);
addFunction("ASIN", ASIN, 1, Value.DOUBLE);
addFunction("ATAN", ATAN, 1, Value.DOUBLE);
addFunction("ATAN2", ATAN2, 2, Value.DOUBLE);
addFunction("BITAND", BITAND, 2, Value.LONG);
addFunction("BITOR", BITOR, 2, Value.LONG);
addFunction("BITXOR", BITXOR, 2, Value.LONG);
addFunction("CEILING", CEILING, 1, Value.DOUBLE);
addFunction("CEIL", CEILING, 1, Value.DOUBLE);
addFunction("COS", COS, 1, Value.DOUBLE);
addFunction("COSH", COSH, 1, Value.DOUBLE);
addFunction("COT", COT, 1, Value.DOUBLE);
addFunction("DEGREES", DEGREES, 1, Value.DOUBLE);
addFunction("EXP", EXP, 1, Value.DOUBLE);
addFunction("FLOOR", FLOOR, 1, Value.DOUBLE);
addFunction("LOG", LOG, 1, Value.DOUBLE);
addFunction("LN", LN, 1, Value.DOUBLE);
addFunction("LOG10", LOG10, 1, Value.DOUBLE);
addFunction("MOD", MOD, 2, Value.LONG);
addFunction("PI", PI, 0, Value.DOUBLE);
addFunction("POWER", POWER, 2, Value.DOUBLE);
addFunction("RADIANS", RADIANS, 1, Value.DOUBLE);
// RAND without argument: get the next value
// RAND with one argument: seed the random generator
addFunctionNotDeterministic("RAND", RAND, VAR_ARGS, Value.DOUBLE);
addFunctionNotDeterministic("RANDOM", RAND, VAR_ARGS, Value.DOUBLE);
addFunction("ROUND", ROUND, VAR_ARGS, Value.DOUBLE);
addFunction("ROUNDMAGIC", ROUNDMAGIC, 1, Value.DOUBLE);
addFunction("SIGN", SIGN, 1, Value.INT);
addFunction("SIN", SIN, 1, Value.DOUBLE);
addFunction("SINH", SINH, 1, Value.DOUBLE);
addFunction("SQRT", SQRT, 1, Value.DOUBLE);
addFunction("TAN", TAN, 1, Value.DOUBLE);
addFunction("TANH", TANH, 1, Value.DOUBLE);
addFunction("TRUNCATE", TRUNCATE, VAR_ARGS, Value.NULL);
// same as TRUNCATE
addFunction("TRUNC", TRUNCATE, VAR_ARGS, Value.NULL);
addFunction("HASH", HASH, 3, Value.BYTES);
addFunction("ENCRYPT", ENCRYPT, 3, Value.BYTES);
addFunction("DECRYPT", DECRYPT, 3, Value.BYTES);
addFunctionNotDeterministic("SECURE_RAND", SECURE_RAND, 1, Value.BYTES);
addFunction("COMPRESS", COMPRESS, VAR_ARGS, Value.BYTES);
addFunction("EXPAND", EXPAND, 1, Value.BYTES);
addFunction("ZERO", ZERO, 0, Value.INT);
addFunctionNotDeterministic("RANDOM_UUID", RANDOM_UUID, 0, Value.UUID);
addFunctionNotDeterministic("SYS_GUID", RANDOM_UUID, 0, Value.UUID);
// string
addFunction("ASCII", ASCII, 1, Value.INT);
addFunction("BIT_LENGTH", BIT_LENGTH, 1, Value.LONG);
addFunction("CHAR", CHAR, 1, Value.STRING);
addFunction("CHR", CHAR, 1, Value.STRING);
addFunction("CHAR_LENGTH", CHAR_LENGTH, 1, Value.INT);
// same as CHAR_LENGTH
addFunction("CHARACTER_LENGTH", CHAR_LENGTH, 1, Value.INT);
addFunctionWithNull("CONCAT", CONCAT, VAR_ARGS, Value.STRING);
addFunctionWithNull("CONCAT_WS", CONCAT_WS, VAR_ARGS, Value.STRING);
addFunction("DIFFERENCE", DIFFERENCE, 2, Value.INT);
addFunction("HEXTORAW", HEXTORAW, 1, Value.STRING);
addFunctionWithNull("INSERT", INSERT, 4, Value.STRING);
addFunction("LCASE", LCASE, 1, Value.STRING);
addFunction("LEFT", LEFT, 2, Value.STRING);
addFunction("LENGTH", LENGTH, 1, Value.LONG);
// 2 or 3 arguments
addFunction("LOCATE", LOCATE, VAR_ARGS, Value.INT);
// alias for MSSQLServer
addFunction("CHARINDEX", LOCATE, VAR_ARGS, Value.INT);
// same as LOCATE with 2 arguments
addFunction("POSITION", LOCATE, 2, Value.INT);
addFunction("INSTR", INSTR, VAR_ARGS, Value.INT);
addFunction("LTRIM", LTRIM, VAR_ARGS, Value.STRING);
addFunction("OCTET_LENGTH", OCTET_LENGTH, 1, Value.LONG);
addFunction("RAWTOHEX", RAWTOHEX, 1, Value.STRING);
addFunction("REPEAT", REPEAT, 2, Value.STRING);
addFunction("REPLACE", REPLACE, VAR_ARGS, Value.STRING);
addFunction("RIGHT", RIGHT, 2, Value.STRING);
addFunction("RTRIM", RTRIM, VAR_ARGS, Value.STRING);
addFunction("SOUNDEX", SOUNDEX, 1, Value.STRING);
addFunction("SPACE", SPACE, 1, Value.STRING);
addFunction("SUBSTR", SUBSTR, VAR_ARGS, Value.STRING);
addFunction("SUBSTRING", SUBSTRING, VAR_ARGS, Value.STRING);
addFunction("UCASE", UCASE, 1, Value.STRING);
addFunction("LOWER", LOWER, 1, Value.STRING);
addFunction("UPPER", UPPER, 1, Value.STRING);
addFunction("POSITION", POSITION, 2, Value.INT);
addFunction("TRIM", TRIM, VAR_ARGS, Value.STRING);
addFunction("STRINGENCODE", STRINGENCODE, 1, Value.STRING);
addFunction("STRINGDECODE", STRINGDECODE, 1, Value.STRING);
addFunction("STRINGTOUTF8", STRINGTOUTF8, 1, Value.BYTES);
addFunction("UTF8TOSTRING", UTF8TOSTRING, 1, Value.STRING);
addFunction("XMLATTR", XMLATTR, 2, Value.STRING);
addFunctionWithNull("XMLNODE", XMLNODE, VAR_ARGS, Value.STRING);
addFunction("XMLCOMMENT", XMLCOMMENT, 1, Value.STRING);
addFunction("XMLCDATA", XMLCDATA, 1, Value.STRING);
addFunction("XMLSTARTDOC", XMLSTARTDOC, 0, Value.STRING);
addFunction("XMLTEXT", XMLTEXT, VAR_ARGS, Value.STRING);
addFunction("REGEXP_REPLACE", REGEXP_REPLACE, 3, Value.STRING);
addFunction("RPAD", RPAD, VAR_ARGS, Value.STRING);
addFunction("LPAD", LPAD, VAR_ARGS, Value.STRING);
// date
addFunctionNotDeterministic("CURRENT_DATE", CURRENT_DATE, 0, Value.DATE);
addFunctionNotDeterministic("CURDATE", CURDATE, 0, Value.DATE);
// alias for MSSQLServer
addFunctionNotDeterministic("GETDATE", CURDATE, 0, Value.DATE);
addFunctionNotDeterministic("CURRENT_TIME", CURRENT_TIME, 0, Value.TIME);
addFunctionNotDeterministic("CURTIME", CURTIME, 0, Value.TIME);
addFunctionNotDeterministic("CURRENT_TIMESTAMP", CURRENT_TIMESTAMP, VAR_ARGS, Value.TIMESTAMP);
addFunctionNotDeterministic("NOW", NOW, VAR_ARGS, Value.TIMESTAMP);
addFunction("DATEADD", DATE_ADD, 3, Value.TIMESTAMP);
addFunction("TIMESTAMPADD", DATE_ADD, 3, Value.LONG);
addFunction("DATEDIFF", DATE_DIFF, 3, Value.LONG);
addFunction("TIMESTAMPDIFF", DATE_DIFF, 3, Value.LONG);
addFunction("DAYNAME", DAY_NAME, 1, Value.STRING);
addFunction("DAYNAME", DAY_NAME, 1, Value.STRING);
addFunction("DAY", DAY_OF_MONTH, 1, Value.INT);
addFunction("DAY_OF_MONTH", DAY_OF_MONTH, 1, Value.INT);
addFunction("DAY_OF_WEEK", DAY_OF_WEEK, 1, Value.INT);
addFunction("DAY_OF_YEAR", DAY_OF_YEAR, 1, Value.INT);
addFunction("DAYOFMONTH", DAY_OF_MONTH, 1, Value.INT);
addFunction("DAYOFWEEK", DAY_OF_WEEK, 1, Value.INT);
addFunction("DAYOFYEAR", DAY_OF_YEAR, 1, Value.INT);
addFunction("HOUR", HOUR, 1, Value.INT);
addFunction("MINUTE", MINUTE, 1, Value.INT);
addFunction("MONTH", MONTH, 1, Value.INT);
addFunction("MONTHNAME", MONTH_NAME, 1, Value.STRING);
addFunction("QUARTER", QUARTER, 1, Value.INT);
addFunction("SECOND", SECOND, 1, Value.INT);
addFunction("WEEK", WEEK, 1, Value.INT);
addFunction("YEAR", YEAR, 1, Value.INT);
addFunction("EXTRACT", EXTRACT, 2, Value.INT);
addFunctionWithNull("FORMATDATETIME", FORMATDATETIME, VAR_ARGS, Value.STRING);
addFunctionWithNull("PARSEDATETIME", PARSEDATETIME, VAR_ARGS, Value.TIMESTAMP);
addFunction("ISO_YEAR", ISO_YEAR, 1, Value.INT);
addFunction("ISO_WEEK", ISO_WEEK, 1, Value.INT);
addFunction("ISO_DAY_OF_WEEK", ISO_DAY_OF_WEEK, 1, Value.INT);
// system
addFunctionNotDeterministic("DATABASE", DATABASE, 0, Value.STRING);
addFunctionNotDeterministic("USER", USER, 0, Value.STRING);
addFunctionNotDeterministic("CURRENT_USER", CURRENT_USER, 0, Value.STRING);
addFunctionNotDeterministic("IDENTITY", IDENTITY, 0, Value.LONG);
addFunctionNotDeterministic("SCOPE_IDENTITY", SCOPE_IDENTITY, 0, Value.LONG);
addFunctionNotDeterministic("IDENTITY_VAL_LOCAL", IDENTITY, 0, Value.LONG);
addFunctionNotDeterministic("LAST_INSERT_ID", IDENTITY, 0, Value.LONG);
addFunctionNotDeterministic("LASTVAL", IDENTITY, 0, Value.LONG);
addFunctionNotDeterministic("AUTOCOMMIT", AUTOCOMMIT, 0, Value.BOOLEAN);
addFunctionNotDeterministic("READONLY", READONLY, 0, Value.BOOLEAN);
addFunction("DATABASE_PATH", DATABASE_PATH, 0, Value.STRING);
addFunctionNotDeterministic("LOCK_TIMEOUT", LOCK_TIMEOUT, 0, Value.INT);
addFunctionWithNull("IFNULL", IFNULL, 2, Value.NULL);
addFunctionWithNull("ISNULL", IFNULL, 2, Value.NULL);
addFunctionWithNull("CASEWHEN", CASEWHEN, 3, Value.NULL);
addFunctionWithNull("CONVERT", CONVERT, 1, Value.NULL);
addFunctionWithNull("CAST", CAST, 1, Value.NULL);
addFunctionWithNull("TRUNCATE_VALUE", TRUNCATE_VALUE, 3, Value.NULL);
addFunctionWithNull("COALESCE", COALESCE, VAR_ARGS, Value.NULL);
addFunctionWithNull("NVL", COALESCE, VAR_ARGS, Value.NULL);
addFunctionWithNull("NVL2", NVL2, 3, Value.NULL);
addFunctionWithNull("NULLIF", NULLIF, 2, Value.NULL);
addFunctionWithNull("CASE", CASE, VAR_ARGS, Value.NULL);
addFunctionNotDeterministic("NEXTVAL", NEXTVAL, VAR_ARGS, Value.LONG);
addFunctionNotDeterministic("CURRVAL", CURRVAL, VAR_ARGS, Value.LONG);
addFunction("ARRAY_GET", ARRAY_GET, 2, Value.STRING);
addFunction("ARRAY_CONTAINS", ARRAY_CONTAINS, 2, Value.BOOLEAN, false, true, false);
addFunction("CSVREAD", CSVREAD, VAR_ARGS, Value.RESULT_SET, false, false, true);
addFunction("CSVWRITE", CSVWRITE, VAR_ARGS, Value.INT, false, false, false);
addFunctionNotDeterministic("MEMORY_FREE", MEMORY_FREE, 0, Value.INT);
addFunctionNotDeterministic("MEMORY_USED", MEMORY_USED, 0, Value.INT);
addFunctionNotDeterministic("LOCK_MODE", LOCK_MODE, 0, Value.INT);
addFunctionNotDeterministic("SCHEMA", SCHEMA, 0, Value.STRING);
addFunctionNotDeterministic("SESSION_ID", SESSION_ID, 0, Value.INT);
addFunction("ARRAY_LENGTH", ARRAY_LENGTH, 1, Value.INT);
addFunctionNotDeterministic("LINK_SCHEMA", LINK_SCHEMA, 6, Value.RESULT_SET);
addFunctionWithNull("LEAST", LEAST, VAR_ARGS, Value.NULL);
addFunctionWithNull("GREATEST", GREATEST, VAR_ARGS, Value.NULL);
addFunctionNotDeterministic("CANCEL_SESSION", CANCEL_SESSION, 1, Value.BOOLEAN);
addFunction("SET", SET, 2, Value.NULL, false, false, false);
addFunction("FILE_READ", FILE_READ, VAR_ARGS, Value.NULL, false, false, false);
addFunctionNotDeterministic("TRANSACTION_ID", TRANSACTION_ID, 0, Value.STRING);
addFunctionWithNull("DECODE", DECODE, VAR_ARGS, Value.NULL);
addFunctionNotDeterministic("DISK_SPACE_USED", DISK_SPACE_USED, 1, Value.LONG);
addFunction("LEALONE_VERSION", LEALONE_VERSION, 0, Value.STRING);
// TableFunction
addFunctionWithNull("TABLE", TABLE, VAR_ARGS, Value.RESULT_SET);
addFunctionWithNull("TABLE_DISTINCT", TABLE_DISTINCT, VAR_ARGS, Value.RESULT_SET);
// pseudo function
addFunctionWithNull("ROW_NUMBER", ROW_NUMBER, 0, Value.LONG);
// service function
addFunctionNotDeterministic("EXECUTE_SERVICE_NO_RETURN_VALUE", EXECUTE_SERVICE_NO_RETURN_VALUE, 2, Value.NULL);
addFunctionNotDeterministic("EXECUTE_SERVICE_WITH_RETURN_VALUE", EXECUTE_SERVICE_WITH_RETURN_VALUE, 2,
Value.STRING);
}
protected Function(Database database, FunctionInfo info) {
this.database = database;
this.info = info;
if (info.parameterCount == VAR_ARGS) {
varArgs = New.arrayList();
} else {
args = new Expression[info.parameterCount];
}
}
private static void addFunction(String name, int type, int parameterCount, int dataType,
boolean nullIfParameterIsNull, boolean deterministic, boolean bufferResultSetToLocalTemp) {
FunctionInfo info = new FunctionInfo();
info.name = name;
info.type = type;
info.parameterCount = parameterCount;
info.dataType = dataType;
info.nullIfParameterIsNull = nullIfParameterIsNull;
info.deterministic = deterministic;
info.bufferResultSetToLocalTemp = bufferResultSetToLocalTemp;
FUNCTIONS.put(name, info);
}
private static void addFunctionNotDeterministic(String name, int type, int parameterCount, int dataType) {
addFunction(name, type, parameterCount, dataType, true, false, false);
}
private static void addFunction(String name, int type, int parameterCount, int dataType) {
addFunction(name, type, parameterCount, dataType, true, true, false);
}
private static void addFunctionWithNull(String name, int type, int parameterCount, int dataType) {
addFunction(name, type, parameterCount, dataType, false, true, false);
}
/**
* Get the function info object for this function, or null if there is no
* such function.
*
* @param name the function name
* @return the function info
*/
private static FunctionInfo getFunctionInfo(String name) {
return FUNCTIONS.get(name);
}
/**
* Get an instance of the given function for this database.
* If no function with this name is found, null is returned.
*
* @param database the database
* @param name the function name
* @return the function object or null
*/
public static Function getFunction(Database database, String name) {
if (!database.getSettings().databaseToUpper) {
// if not yet converted to uppercase, do it now
name = StringUtils.toUpperEnglish(name);
}
FunctionInfo info = getFunctionInfo(name);
if (info == null) {
return null;
}
switch (info.type) {
case TABLE:
case TABLE_DISTINCT:
return new TableFunction(database, info, Long.MAX_VALUE);
default:
return new Function(database, info);
}
}
/**
* Set the parameter expression at the given index.
*
* @param index the index (0, 1,...)
* @param param the expression
*/
public void setParameter(int index, Expression param) {
if (varArgs != null) {
varArgs.add(param);
} else {
if (index >= args.length) {
throw DbException.get(ErrorCode.INVALID_PARAMETER_COUNT_2, info.name, "" + args.length);
}
args[index] = param;
}
}
private static strictfp double log10(double value) {
return roundmagic(StrictMath.log(value) / StrictMath.log(10));
}
@Override
public Value getValue(ServerSession session) {
return getValueWithArgs(session, args);
}
private Value getSimpleValue(ServerSession session, Value v0, Expression[] args, Value[] values) {
Value result;
switch (info.type) {
case ABS:
result = v0.getSignum() > 0 ? v0 : v0.negate();
break;
case ACOS:
result = ValueDouble.get(Math.acos(v0.getDouble()));
break;
case ASIN:
result = ValueDouble.get(Math.asin(v0.getDouble()));
break;
case ATAN:
result = ValueDouble.get(Math.atan(v0.getDouble()));
break;
case CEILING:
result = ValueDouble.get(Math.ceil(v0.getDouble()));
break;
case COS:
result = ValueDouble.get(Math.cos(v0.getDouble()));
break;
case COSH:
result = ValueDouble.get(Math.cosh(v0.getDouble()));
break;
case COT: {
double d = Math.tan(v0.getDouble());
if (d == 0.0) {
throw DbException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
}
result = ValueDouble.get(1. / d);
break;
}
case DEGREES:
result = ValueDouble.get(Math.toDegrees(v0.getDouble()));
break;
case EXP:
result = ValueDouble.get(Math.exp(v0.getDouble()));
break;
case FLOOR:
result = ValueDouble.get(Math.floor(v0.getDouble()));
break;
case LN:
result = ValueDouble.get(Math.log(v0.getDouble()));
break;
case LOG:
if (database.getMode().logIsLogBase10) {
result = ValueDouble.get(Math.log10(v0.getDouble()));
} else {
result = ValueDouble.get(Math.log(v0.getDouble()));
}
break;
case LOG10:
result = ValueDouble.get(log10(v0.getDouble()));
break;
case PI:
result = ValueDouble.get(Math.PI);
break;
case RADIANS:
result = ValueDouble.get(Math.toRadians(v0.getDouble()));
break;
case RAND: {
if (v0 != null) {
session.getRandom().setSeed(v0.getInt());
}
result = ValueDouble.get(session.getRandom().nextDouble());
break;
}
case ROUNDMAGIC:
result = ValueDouble.get(roundmagic(v0.getDouble()));
break;
case SIGN:
result = ValueInt.get(v0.getSignum());
break;
case SIN:
result = ValueDouble.get(Math.sin(v0.getDouble()));
break;
case SINH:
result = ValueDouble.get(Math.sinh(v0.getDouble()));
break;
case SQRT:
result = ValueDouble.get(Math.sqrt(v0.getDouble()));
break;
case TAN:
result = ValueDouble.get(Math.tan(v0.getDouble()));
break;
case TANH:
result = ValueDouble.get(Math.tanh(v0.getDouble()));
break;
case SECURE_RAND:
result = ValueBytes.getNoCopy(MathUtils.secureRandomBytes(v0.getInt()));
break;
case EXPAND:
result = ValueBytes.getNoCopy(CompressTool.getInstance().expand(v0.getBytesNoCopy()));
break;
case ZERO:
result = ValueInt.get(0);
break;
case RANDOM_UUID:
result = ValueUuid.getNewRandom();
break;
// string
case ASCII: {
String s = v0.getString();
if (s.length() == 0) {
result = ValueNull.INSTANCE;
} else {
result = ValueInt.get(s.charAt(0));
}
break;
}
case BIT_LENGTH:
result = ValueLong.get(16 * length(v0));
break;
case CHAR:
result = ValueString.get(String.valueOf((char) v0.getInt()));
break;
case CHAR_LENGTH:
case LENGTH:
result = ValueLong.get(length(v0));
break;
case OCTET_LENGTH:
result = ValueLong.get(2 * length(v0));
break;
case CONCAT_WS:
case CONCAT: {
result = ValueNull.INSTANCE;
int start = 0;
String separator = "";
if (info.type == CONCAT_WS) {
start = 1;
separator = getNullOrValue(session, args, values, 0).getString();
}
for (int i = start; i < args.length; i++) {
Value v = getNullOrValue(session, args, values, i);
if (v == ValueNull.INSTANCE) {
continue;
}
if (result == ValueNull.INSTANCE) {
result = v;
} else {
String tmp = v.getString();
if (!StringUtils.isNullOrEmpty(separator) && !StringUtils.isNullOrEmpty(tmp)) {
tmp = separator.concat(tmp);
}
result = ValueString.get(result.getString().concat(tmp));
}
}
if (info.type == CONCAT_WS) {
if (separator != null && result == ValueNull.INSTANCE) {
result = ValueString.get("");
}
}
break;
}
case HEXTORAW:
result = ValueString.get(hexToRaw(v0.getString()));
break;
case LOWER:
case LCASE:
// TODO this is locale specific, need to document or provide a way
// to set the locale
result = ValueString.get(v0.getString().toLowerCase());
break;
case RAWTOHEX:
result = ValueString.get(rawToHex(v0.getString()));
break;
case SOUNDEX:
result = ValueString.get(getSoundex(v0.getString()));
break;
case SPACE: {
int len = Math.max(0, v0.getInt());
char[] chars = new char[len];
for (int i = len - 1; i >= 0; i--) {
chars[i] = ' ';
}
result = ValueString.get(new String(chars));
break;
}
case UPPER:
case UCASE:
// TODO this is locale specific, need to document or provide a way
// to set the locale
result = ValueString.get(v0.getString().toUpperCase());
break;
case STRINGENCODE:
result = ValueString.get(StringUtils.javaEncode(v0.getString()));
break;
case STRINGDECODE:
result = ValueString.get(StringUtils.javaDecode(v0.getString()));
break;
case STRINGTOUTF8:
result = ValueBytes.getNoCopy(v0.getString().getBytes(Constants.UTF8));
break;
case UTF8TOSTRING:
result = ValueString.get(new String(v0.getBytesNoCopy(), Constants.UTF8));
break;
case XMLCOMMENT:
result = ValueString.get(StringUtils.xmlComment(v0.getString()));
break;
case XMLCDATA:
result = ValueString.get(StringUtils.xmlCData(v0.getString()));
break;
case XMLSTARTDOC:
result = ValueString.get(StringUtils.xmlStartDoc());
break;
case DAY_NAME: {
SimpleDateFormat dayName = new SimpleDateFormat("EEEE", Locale.ENGLISH);
result = ValueString.get(dayName.format(v0.getDate()));
break;
}
case DAY_OF_MONTH:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.DAY_OF_MONTH));
break;
case DAY_OF_WEEK:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.DAY_OF_WEEK));
break;
case DAY_OF_YEAR:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.DAY_OF_YEAR));
break;
case HOUR:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getTimestamp(), Calendar.HOUR_OF_DAY));
break;
case MINUTE:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getTimestamp(), Calendar.MINUTE));
break;
case MONTH:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.MONTH));
break;
case MONTH_NAME: {
SimpleDateFormat monthName = new SimpleDateFormat("MMMM", Locale.ENGLISH);
result = ValueString.get(monthName.format(v0.getDate()));
break;
}
case QUARTER:
result = ValueInt.get((DateTimeUtils.getDatePart(v0.getDate(), Calendar.MONTH) - 1) / 3 + 1);
break;
case SECOND:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getTimestamp(), Calendar.SECOND));
break;
case WEEK:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.WEEK_OF_YEAR));
break;
case YEAR:
result = ValueInt.get(DateTimeUtils.getDatePart(v0.getDate(), Calendar.YEAR));
break;
case ISO_YEAR:
result = ValueInt.get(DateTimeUtils.getIsoYear(v0.getDate()));
break;
case ISO_WEEK:
result = ValueInt.get(DateTimeUtils.getIsoWeek(v0.getDate()));
break;
case ISO_DAY_OF_WEEK:
result = ValueInt.get(DateTimeUtils.getIsoDayOfWeek(v0.getDate()));
break;
case CURDATE:
case CURRENT_DATE: {
long now = session.getTransactionStart();
// need to normalize
result = ValueDate.get(new Date(now));
break;
}
case CURTIME:
case CURRENT_TIME: {
long now = session.getTransactionStart();
// need to normalize
result = ValueTime.get(new Time(now));
break;
}
case NOW:
case CURRENT_TIMESTAMP: {
long now = session.getTransactionStart();
ValueTimestamp vt = ValueTimestamp.get(new Timestamp(now));
if (v0 != null) {
Mode mode = database.getMode();
vt = (ValueTimestamp) vt.convertScale(mode.convertOnlyToSmallerScale, v0.getInt());
}
result = vt;
break;
}
case DATABASE:
result = ValueString.get(database.getShortName());
break;
case USER:
case CURRENT_USER:
result = ValueString.get(session.getUser().getName());
break;
case IDENTITY:
result = session.getLastIdentity();
break;
case SCOPE_IDENTITY:
result = session.getLastScopeIdentity();
break;
case AUTOCOMMIT:
result = ValueBoolean.get(session.isAutoCommit());
break;
case READONLY:
result = ValueBoolean.get(database.isReadOnly());
break;
case DATABASE_PATH: {
String path = database.getDatabasePath();
result = path == null ? (Value) ValueNull.INSTANCE : ValueString.get(path);
break;
}
case LOCK_TIMEOUT:
result = ValueInt.get(session.getLockTimeout());
break;
case DISK_SPACE_USED:
result = ValueLong.get(getDiskSpaceUsed(session, v0));
break;
case CAST:
case CONVERT: {
v0 = v0.convertTo(dataType);
Mode mode = database.getMode();
v0 = v0.convertScale(mode.convertOnlyToSmallerScale, scale);
v0 = v0.convertPrecision(getPrecision(), false);
result = v0;
break;
}
case MEMORY_FREE:
session.getUser().checkAdmin();
result = ValueInt.get(Utils.getMemoryFree());
break;
case MEMORY_USED:
session.getUser().checkAdmin();
result = ValueInt.get(Utils.getMemoryUsed());
break;
case LOCK_MODE:
result = ValueInt.get(database.getLockMode());
break;
case SCHEMA:
result = ValueString.get(session.getCurrentSchemaName());
break;
case SESSION_ID:
result = ValueInt.get(session.getId());
break;
case IFNULL: {
result = v0;
if (v0 == ValueNull.INSTANCE) {
result = getNullOrValue(session, args, values, 1);
}
break;
}
case CASEWHEN: {
Value v;
if (v0 == ValueNull.INSTANCE || !v0.getBoolean().booleanValue()) {
v = getNullOrValue(session, args, values, 2);
} else {
v = getNullOrValue(session, args, values, 1);
}
result = v.convertTo(dataType);
break;
}
case DECODE: {
int index = -1;
for (int i = 1; i < args.length - 1; i += 2) {
if (database.areEqual(v0, getNullOrValue(session, args, values, i))) {
index = i + 1;
}
}
if (index < 0 && args.length % 2 == 0) {
index = args.length - 1;
}
Value v = index < 0 ? ValueNull.INSTANCE : getNullOrValue(session, args, values, index);
result = v.convertTo(dataType);
break;
}
case NVL2: {
Value v;
if (v0 == ValueNull.INSTANCE) {
v = getNullOrValue(session, args, values, 2);
} else {
v = getNullOrValue(session, args, values, 1);
}
result = v.convertTo(dataType);
break;
}
case COALESCE: {
result = v0;
for (int i = 0; i < args.length; i++) {
Value v = getNullOrValue(session, args, values, i);
if (!(v == ValueNull.INSTANCE)) {
result = v.convertTo(dataType);
break;
}
}
break;
}
case GREATEST:
case LEAST: {
result = ValueNull.INSTANCE;
for (int i = 0; i < args.length; i++) {
Value v = getNullOrValue(session, args, values, i);
if (!(v == ValueNull.INSTANCE)) {
v = v.convertTo(dataType);
if (result == ValueNull.INSTANCE) {
result = v;
} else {
int comp = database.compareTypeSafe(result, v);
if (info.type == GREATEST && comp < 0) {
result = v;
} else if (info.type == LEAST && comp > 0) {
result = v;
}
}
}
}
break;
}
case CASE: {
result = null;
int i = 0;
for (; i < args.length; i++) {
Value when = getNullOrValue(session, args, values, i++);
if (Boolean.TRUE.equals(when)) {
result = getNullOrValue(session, args, values, i);
break;
}
}
if (result == null) {
result = i < args.length ? getNullOrValue(session, args, values, i) : ValueNull.INSTANCE;
}
break;
}
case ARRAY_GET: {
if (v0.getType() == Value.ARRAY) {
Value v1 = getNullOrValue(session, args, values, 1);
int element = v1.getInt();
Value[] list = ((ValueArray) v0).getList();
if (element < 1 || element > list.length) {
result = ValueNull.INSTANCE;
} else {
result = list[element - 1];
}
} else {
result = ValueNull.INSTANCE;
}
break;
}
case ARRAY_LENGTH: {
if (v0.getType() == Value.ARRAY) {
Value[] list = ((ValueArray) v0).getList();
result = ValueInt.get(list.length);
} else {
result = ValueNull.INSTANCE;
}
break;
}
case ARRAY_CONTAINS: {
result = ValueBoolean.get(false);
if (v0.getType() == Value.ARRAY) {
Value v1 = getNullOrValue(session, args, values, 1);
Value[] list = ((ValueArray) v0).getList();
for (Value v : list) {
if (v.equals(v1)) {
result = ValueBoolean.get(true);
break;
}
}
}
break;
}
case CANCEL_SESSION: {
result = ValueBoolean.get(cancelStatement(session, v0.getInt()));
break;
}
case TRANSACTION_ID: {
result = session.getTransactionId();
break;
}
case EXECUTE_SERVICE_NO_RETURN_VALUE: {
Value v1 = getNullOrValue(session, args, values, 1);
ServiceExecuterManager.executeServiceNoReturnValue(v0.getString(), v1.getString());
result = ValueNull.INSTANCE;
break;
}
case EXECUTE_SERVICE_WITH_RETURN_VALUE: {
Value v1 = getNullOrValue(session, args, values, 1);
String r = ServiceExecuterManager.executeServiceWithReturnValue(v0.getString(), v1.getString());
result = ValueString.get(r);
break;
}
default:
result = null;
}
return result;
}
private static boolean cancelStatement(ServerSession session, int targetSessionId) {
session.getUser().checkAdmin();
ServerSession[] sessions = session.getDatabase().getSessions(false);
for (ServerSession s : sessions) {
if (s.getId() == targetSessionId) {
Command c = s.getCurrentCommand();
if (c == null) {
return false;
}
c.cancel();
return true;
}
}
return false;
}
private static long getDiskSpaceUsed(ServerSession session, Value v0) {
Parser p = new Parser(session);
String sql = v0.getString();
Table table = p.parseTableName(sql);
return table.getDiskSpaceUsed();
}
private static Value getNullOrValue(ServerSession session, Expression[] args, Value[] values, int i) {
if (i >= args.length) {
return null;
}
Value v = values[i];
if (v == null) {
v = values[i] = args[i].getValue(session);
}
return v;