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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,
* 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.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlJsonConstructorNullClause;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeFamily;
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.SqlValidatorImpl;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidatorScope;
import com.hazelcast.org.apache.calcite.util.Optionality;
import java.util.Objects;
/**
* The JSON_OBJECTAGG aggregate function.
*/
public class SqlJsonObjectAggAggFunction extends SqlAggFunction {
private final SqlJsonConstructorNullClause nullClause;
/** Creates a SqlJsonObjectAggAggFunction. */
public SqlJsonObjectAggAggFunction(SqlKind kind,
SqlJsonConstructorNullClause nullClause) {
super(kind + "_" + nullClause.name(), null, kind, ReturnTypes.VARCHAR_2000,
(callBinding, returnType, operandTypes) -> {
RelDataTypeFactory typeFactory = callBinding.getTypeFactory();
operandTypes[0] = typeFactory.createSqlType(SqlTypeName.VARCHAR);
operandTypes[1] = typeFactory.createTypeWithNullability(
typeFactory.createSqlType(SqlTypeName.ANY), true);
}, OperandTypes.family(SqlTypeFamily.CHARACTER,
SqlTypeFamily.ANY),
SqlFunctionCategory.SYSTEM, false, false, Optionality.FORBIDDEN);
this.nullClause = Objects.requireNonNull(nullClause);
}
@Override public void unparse(SqlWriter writer, SqlCall call, int leftPrec,
int rightPrec) {
assert call.operandCount() == 2;
final SqlWriter.Frame frame = writer.startFunCall("JSON_OBJECTAGG");
writer.keyword("KEY");
call.operand(0).unparse(writer, leftPrec, rightPrec);
writer.keyword("VALUE");
call.operand(1).unparse(writer, leftPrec, rightPrec);
writer.keyword(nullClause.sql);
writer.endFunCall(frame);
}
@Override public RelDataType deriveType(SqlValidator validator,
SqlValidatorScope scope, SqlCall call) {
// To prevent operator rewriting by SqlFunction#deriveType.
for (SqlNode operand : call.getOperandList()) {
RelDataType nodeType = validator.deriveType(scope, operand);
((SqlValidatorImpl) validator).setValidatedNodeType(operand, nodeType);
}
return validateOperands(validator, scope, call);
}
public SqlJsonObjectAggAggFunction with(SqlJsonConstructorNullClause nullClause) {
return this.nullClause == nullClause ? this
: new SqlJsonObjectAggAggFunction(getKind(), nullClause);
}
public SqlJsonConstructorNullClause getNullClause() {
return nullClause;
}
}