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Merged
merged 1 commit into from
Oct 4, 2017
Merged

new feature: cast #514

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63 changes: 63 additions & 0 deletions src/main/java/org/nlpcn/es4sql/parse/CastParser.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,63 @@
package org.nlpcn.es4sql.parse;

import com.alibaba.druid.sql.ast.expr.SQLCastExpr;
import com.google.common.base.Joiner;
import org.nlpcn.es4sql.SQLFunctions;
import org.nlpcn.es4sql.Util;
import org.nlpcn.es4sql.exception.SqlParseException;

import java.util.ArrayList;
import java.util.List;

/**
* Created by leonlu on 2017/9/21.
*/
public class CastParser {

private enum DataType {
INT, LONG, FLOAT, DOUBLE, STRING, DATETIME
}

private SQLCastExpr castExpr;
private String alias;
private String tableAlias;

public CastParser(SQLCastExpr castExpr, String alias, String tableAlias) {
this.castExpr = castExpr;
this.alias = alias;
this.tableAlias = tableAlias;
}

public String parse(boolean isReturn) throws SqlParseException {
List<String> result = new ArrayList<>();

String dataType = castExpr.getDataType().getName().toUpperCase();
String fileName = String.format("doc['%s'].value",Util.expr2Object(castExpr.getExpr()));
String name = "field_"+SQLFunctions.random();

try {
if (DataType.valueOf(dataType) == DataType.INT) {
result.add(String.format("def %s = Double.parseDouble(%s.toString()).intValue()", name, fileName));
} else if (DataType.valueOf(dataType) == DataType.LONG) {
result.add(String.format("def %s = Double.parseDouble(%s.toString()).longValue()", name, fileName));
} else if (DataType.valueOf(dataType) == DataType.FLOAT) {
result.add(String.format("def %s = Double.parseDouble(%s.toString()).floatValue()", name, fileName));
} else if (DataType.valueOf(dataType) == DataType.DOUBLE) {
result.add(String.format("def %s = Double.parseDouble(%s.toString()).doubleValue()", name, fileName));
} else if (DataType.valueOf(dataType) == DataType.STRING) {
result.add(String.format("def %s = %s.toString()",name, fileName));
} else if (DataType.valueOf(dataType) == DataType.DATETIME) {
result.add(String.format("def %s = new Date(Double.parseDouble(%s.toString()).longValue())", name, fileName));
} else {
throw new SqlParseException("not support cast to data type:" + dataType);
}
if(isReturn) {
result.add("return " + name);
}

return Joiner.on("; ").join(result);
} catch (Exception ex) {
throw new SqlParseException(String.format("field cast to type: %s failed. error:%s",dataType, ex.getMessage()));
}
}
}
13 changes: 13 additions & 0 deletions src/main/java/org/nlpcn/es4sql/parse/FieldMaker.java
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Expand Up @@ -61,6 +61,16 @@ public static Field makeField(SQLExpr expr, String alias, String tableAlias) thr
methodParameters.add(new KVValue(alias));
methodParameters.add(new KVValue(scriptCode));
return new MethodField("script", methodParameters, null, alias);
}else if (expr instanceof SQLCastExpr) {
SQLCastExpr castExpr = (SQLCastExpr) expr;
if (alias == null) {
alias = "cast_" + castExpr.getExpr().toString();
}
String scriptCode = new CastParser(castExpr, alias, tableAlias).parse(true);
List<KVValue> methodParameters = new ArrayList<>();
methodParameters.add(new KVValue(alias));
methodParameters.add(new KVValue(scriptCode));
return new MethodField("script", methodParameters, null, alias);
} else {
throw new SqlParseException("unknown field name : " + expr);
}
Expand Down Expand Up @@ -251,6 +261,9 @@ public static MethodField makeMethodField(String name, List<SQLExpr> arguments,
} else if (object instanceof SQLCaseExpr) {
String scriptCode = new CaseWhenParser((SQLCaseExpr) object, alias, tableAlias).parse();
paramers.add(new KVValue("script",new SQLCharExpr(scriptCode)));
} else if(object instanceof SQLCastExpr) {
String scriptCode = new CastParser((SQLCastExpr) object, alias, tableAlias).parse(false);
paramers.add(new KVValue("script",new SQLCharExpr(scriptCode)));
} else {
paramers.add(new KVValue(Util.removeTableAilasFromField(object, tableAlias)));
}
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125 changes: 125 additions & 0 deletions src/test/java/org/nlpcn/es4sql/SqlParserTests.java
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Expand Up @@ -986,6 +986,131 @@ public void caseWhenTestWithouhtElseExpr() throws SqlParseException {

}

@Test
public void castToIntTest() throws Exception {
String query = "select cast(age as int) from "+ TestsConstants.TEST_INDEX + "/account limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_age",alias);
Assert.assertTrue(scriptCode.contains("doc['age'].value"));
Assert.assertTrue(scriptCode.contains("Double.parseDouble(doc['age'].value.toString()).intValue()"));
}

@Test
public void castToLongTest() throws Exception {
String query = "select cast(insert_time as long) from "+ TestsConstants.TEST_INDEX + " limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_insert_time",alias);
Assert.assertTrue(scriptCode.contains("doc['insert_time'].value"));
Assert.assertTrue(scriptCode.contains("Double.parseDouble(doc['insert_time'].value.toString()).longValue()"));
}

@Test
public void castToFloatTest() throws Exception {
String query = "select cast(age as float) from "+ TestsConstants.TEST_INDEX + " limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_age",alias);
Assert.assertTrue(scriptCode.contains("doc['age'].value"));
Assert.assertTrue(scriptCode.contains("Double.parseDouble(doc['age'].value.toString()).floatValue()"));
}

@Test
public void castToDoubleTest() throws Exception {
String query = "select cast(age as double) from "+ TestsConstants.TEST_INDEX + "/account limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_age",alias);
Assert.assertTrue(scriptCode.contains("doc['age'].value"));
Assert.assertTrue(scriptCode.contains("Double.parseDouble(doc['age'].value.toString()).doubleValue()"));
}

@Test
public void castToStringTest() throws Exception {
String query = "select cast(age as string) from "+ TestsConstants.TEST_INDEX + "/account limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_age",alias);
Assert.assertTrue(scriptCode.contains("doc['age'].value.toString()"));
}

@Test
public void castToDateTimeTest() throws Exception {
String query = "select cast(age as datetime) from "+ TestsConstants.TEST_INDEX + "/account limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertEquals("cast_age",alias);
Assert.assertTrue(scriptCode.contains("doc['age'].value"));
Assert.assertTrue(scriptCode.contains("new Date(Double.parseDouble(doc['age'].value.toString()).longValue())"));
}

@Test
public void castToDoubleThenDivideTest() throws Exception {
String query = "select cast(age as double)/2 from "+ TestsConstants.TEST_INDEX + "/account limit 10";
SQLExpr sqlExpr = queryToExpr(query);
Select select = parser.parseSelect((SQLQueryExpr) sqlExpr);
Field castField = select.getFields().get(0);
Assert.assertTrue(castField instanceof MethodField);

MethodField methodField = (MethodField) castField;
Assert.assertEquals("script",castField.getName());

String alias = (String) methodField.getParams().get(0).value;
String scriptCode = (String) methodField.getParams().get(1).value;
Assert.assertTrue(scriptCode.contains("doc['age'].value"));
Assert.assertTrue(scriptCode.contains("Double.parseDouble(doc['age'].value.toString()).doubleValue()"));
Assert.assertTrue(scriptCode.contains("/ 2"));
}


@Test
public void multiSelectMinusOperationCheckIndices() throws SqlParseException {
Expand Down