All Downloads are FREE. Search and download functionalities are using the official Maven repository.

com.hazelcast.org.apache.calcite.sql.SqlTumbleTableFunction Maven / Gradle / Ivy

There is a newer version: 5.5.0
Show newest version
/*
 * 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;

import com.hazelcast.com.google.common.collect.ImmutableList;

/**
 * SqlTumbleTableFunction implements an operator for tumbling.
 *
 * 

It allows three parameters: * *

    *
  1. a table
  2. *
  3. a descriptor to provide a watermarked column name from the input table
  4. *
  5. an interval parameter to specify the length of window size
  6. *
*/ public class SqlTumbleTableFunction extends SqlWindowTableFunction { public SqlTumbleTableFunction() { super(SqlKind.TUMBLE.name(), new OperandMetadataImpl()); } /** Operand type checker for TUMBLE. */ private static class OperandMetadataImpl extends AbstractOperandMetadata { OperandMetadataImpl() { super( ImmutableList.of(PARAM_DATA, PARAM_TIMECOL, PARAM_SIZE, PARAM_OFFSET), 3); } @Override public boolean checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) { // There should only be three operands, and number of operands are checked before // this call. if (!checkTableAndDescriptorOperands(callBinding, 1)) { return throwValidationSignatureErrorOrReturnFalse(callBinding, throwOnFailure); } if (!checkTimeColumnDescriptorOperand(callBinding, 1)) { return throwValidationSignatureErrorOrReturnFalse(callBinding, throwOnFailure); } if (!checkIntervalOperands(callBinding, 2)) { return throwValidationSignatureErrorOrReturnFalse(callBinding, throwOnFailure); } return true; } @Override public String getAllowedSignatures(SqlOperator op, String opName) { return opName + "(TABLE table_name, DESCRIPTOR(timecol), datetime interval" + "[, datetime interval])"; } } }




© 2015 - 2024 Weber Informatics LLC | Privacy Policy