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SqlMapTypeNameSpec.java
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SqlMapTypeNameSpec.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.sql.parser.type;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.sql.SqlDataTypeSpec;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlTypeNameSpec;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.sql.validate.SqlValidator;
import org.apache.calcite.util.Litmus;
/**
* Parse SQL MAP type, i.e. MAP<INT NOT NULL, TIMESTAMP NULL>, the key and value can specify
* a suffix to indicate if the type is nullable, default is nullable.
*
* <p>MAP type does not belong to standard SQL.
*/
public class SqlMapTypeNameSpec extends SqlTypeNameSpec {
private final SqlDataTypeSpec keyType;
private final SqlDataTypeSpec valType;
/**
* Creates a {@code SqlMapTypeNameSpec}.
*
* @param keyType key type
* @param valType value type
* @param pos the parser position
*/
public SqlMapTypeNameSpec(
SqlDataTypeSpec keyType,
SqlDataTypeSpec valType,
SqlParserPos pos) {
super(new SqlIdentifier(SqlTypeName.MAP.getName(), pos), pos);
this.keyType = keyType;
this.valType = valType;
}
public SqlDataTypeSpec getKeyType() {
return keyType;
}
public SqlDataTypeSpec getValType() {
return valType;
}
@Override
public RelDataType deriveType(SqlValidator validator) {
return validator.getTypeFactory()
.createMapType(
keyType.deriveType(validator),
valType.deriveType(validator));
}
@Override
public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
writer.keyword("MAP");
SqlWriter.Frame frame = writer.startList(SqlWriter.FrameTypeEnum.FUN_CALL, "<", ">");
writer.sep(","); // configures the writer
keyType.unparse(writer, leftPrec, rightPrec);
// Default is nullable.
if (keyType.getNullable() != null && !keyType.getNullable()) {
writer.keyword("NOT NULL");
}
writer.sep(",");
valType.unparse(writer, leftPrec, rightPrec);
// Default is nullable.
if (valType.getNullable() != null && !valType.getNullable()) {
writer.keyword("NOT NULL");
}
writer.endList(frame);
}
@Override
public boolean equalsDeep(SqlTypeNameSpec spec, Litmus litmus) {
if (!(spec instanceof SqlMapTypeNameSpec)) {
return litmus.fail("{} != {}", this, spec);
}
SqlMapTypeNameSpec that = (SqlMapTypeNameSpec) spec;
if (!this.keyType.equalsDeep(that.keyType, litmus)) {
return litmus.fail("{} != {}", this, spec);
}
if (!this.valType.equalsDeep(that.valType, litmus)) {
return litmus.fail("{} != {}", this, spec);
}
return litmus.succeed();
}
}