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SqlMultisetValueConstructor.java
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SqlMultisetValueConstructor.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.calcite.sql.fun;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlCallBinding;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperatorBinding;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.type.InferTypes;
import org.apache.calcite.sql.type.OperandTypes;
import org.apache.calcite.sql.type.ReturnTypes;
import org.apache.calcite.sql.type.SqlTypeUtil;
import org.checkerframework.checker.nullness.qual.Nullable;
import java.util.List;
import static org.apache.calcite.util.Static.RESOURCE;
import static java.util.Objects.requireNonNull;
/**
* Definition of the SQL:2003 standard MULTISET constructor, <code>MULTISET
* [<expr>, ...]</code>.
*
* <p>Derived classes construct other kinds of collections.</p>
*
* @see SqlMultisetQueryConstructor
*/
public class SqlMultisetValueConstructor extends SqlSpecialOperator {
//~ Constructors -----------------------------------------------------------
public SqlMultisetValueConstructor() {
this("MULTISET", SqlKind.MULTISET_VALUE_CONSTRUCTOR);
}
protected SqlMultisetValueConstructor(String name, SqlKind kind) {
super(
name,
kind, MDX_PRECEDENCE,
false,
ReturnTypes.ARG0,
InferTypes.FIRST_KNOWN,
OperandTypes.VARIADIC);
}
//~ Methods ----------------------------------------------------------------
@Override public RelDataType inferReturnType(
SqlOperatorBinding opBinding) {
RelDataType type =
getComponentType(
opBinding.getTypeFactory(),
opBinding.collectOperandTypes());
requireNonNull(type, "inferred multiset value");
return SqlTypeUtil.createMultisetType(
opBinding.getTypeFactory(),
type,
false);
}
protected @Nullable RelDataType getComponentType(
RelDataTypeFactory typeFactory,
List<RelDataType> argTypes) {
return typeFactory.leastRestrictive(argTypes);
}
@Override public boolean checkOperandTypes(
SqlCallBinding callBinding,
boolean throwOnFailure) {
final List<RelDataType> argTypes =
SqlTypeUtil.deriveType(callBinding, callBinding.operands());
if (argTypes.size() == 0) {
throw callBinding.newValidationError(RESOURCE.requireAtLeastOneArg());
}
final RelDataType componentType =
getComponentType(
callBinding.getTypeFactory(),
argTypes);
if (null == componentType) {
if (throwOnFailure) {
throw callBinding.newValidationError(RESOURCE.needSameTypeParameter());
}
return false;
}
return true;
}
@Override public void unparse(
SqlWriter writer,
SqlCall call,
int leftPrec,
int rightPrec) {
writer.keyword(getName()); // "MULTISET" or "ARRAY"
final SqlWriter.Frame frame = writer.startList("[", "]");
for (SqlNode operand : call.getOperandList()) {
writer.sep(",");
operand.unparse(writer, leftPrec, rightPrec);
}
writer.endList(frame);
}
}