com.hazelcast.org.apache.calcite.sql.fun.SqlSequenceValueOperator Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.sql.fun;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlIdentifier;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidator;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorScope;
import java.util.List;
/** Operator that returns the current or next value of a sequence. */
public class SqlSequenceValueOperator extends SqlSpecialOperator {
/** Creates a SqlSequenceValueOperator. */
SqlSequenceValueOperator(SqlKind kind) {
super(kind.name(), kind, 100);
assert kind == SqlKind.NEXT_VALUE || kind == SqlKind.CURRENT_VALUE;
}
@Override public boolean isDeterministic() {
return false;
}
@Override public void unparse(SqlWriter writer, SqlCall call, int leftPrec,
int rightPrec) {
writer.sep(kind == SqlKind.NEXT_VALUE
? "NEXT VALUE FOR" : "CURRENT VALUE FOR");
call.getOperandList().get(0).unparse(writer, 0, 0);
}
@Override public RelDataType deriveType(SqlValidator validator,
SqlValidatorScope scope, SqlCall call) {
final RelDataTypeFactory typeFactory = validator.getTypeFactory();
return typeFactory.createTypeWithNullability(
typeFactory.createSqlType(SqlTypeName.BIGINT), false);
}
@Override public void validateCall(SqlCall call, SqlValidator validator,
SqlValidatorScope scope, SqlValidatorScope operandScope) {
List operands = call.getOperandList();
assert operands.size() == 1;
assert operands.get(0) instanceof SqlIdentifier;
SqlIdentifier id = (SqlIdentifier) operands.get(0);
validator.validateSequenceValue(scope, id);
}
}