com.hazelcast.org.apache.calcite.sql.fun.SqlRowOperator Maven / Gradle / Ivy
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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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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,
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* limitations under the License.
*/
package com.hazelcast.org.apache.calcite.sql.fun;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlUtil;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.type.InferTypes;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.util.Pair;
import java.util.AbstractList;
import java.util.Map;
/**
* SqlRowOperator represents the special ROW constructor.
*
* TODO: describe usage for row-value construction and row-type construction
* (SQL supports both).
*/
public class SqlRowOperator extends SqlSpecialOperator {
//~ Constructors -----------------------------------------------------------
public SqlRowOperator(String name) {
super(name,
SqlKind.ROW, MDX_PRECEDENCE,
false,
null,
InferTypes.RETURN_TYPE,
OperandTypes.VARIADIC);
assert name.equals("ROW") || name.equals(" ");
}
//~ Methods ----------------------------------------------------------------
public RelDataType inferReturnType(
final SqlOperatorBinding opBinding) {
// The type of a ROW(e1,e2) expression is a record with the types
// {e1type,e2type}. According to the standard, field names are
// implementation-defined.
return opBinding.getTypeFactory().createStructType(
new AbstractList>() {
public Map.Entry get(int index) {
return Pair.of(
SqlUtil.deriveAliasFromOrdinal(index),
opBinding.getOperandType(index));
}
public int size() {
return opBinding.getOperandCount();
}
});
}
public void unparse(
SqlWriter writer,
SqlCall call,
int leftPrec,
int rightPrec) {
SqlUtil.unparseFunctionSyntax(this, writer, call);
}
// override SqlOperator
public boolean requiresDecimalExpansion() {
return false;
}
}