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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 com.hazelcast.org.apache.calcite.sql.fun;

import com.hazelcast.org.apache.calcite.avatica.util.TimeUnitRange;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
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.validate.SqlMonotonicity;
import com.hazelcast.org.apache.calcite.util.Util;

import static com.hazelcast.org.apache.calcite.sql.validate.SqlNonNullableAccessors.getOperandLiteralValueOrThrow;

/**
 * The SQL EXTRACT operator. Extracts a specified field value from
 * a DATETIME or an INTERVAL. E.g.
* EXTRACT(HOUR FROM INTERVAL '364 23:59:59') returns * 23 */ public class SqlExtractFunction extends SqlFunction { //~ Constructors ----------------------------------------------------------- // SQL2003, Part 2, Section 4.4.3 - extract returns a exact numeric // TODO: Return type should be decimal for seconds public SqlExtractFunction() { super("EXTRACT", SqlKind.EXTRACT, ReturnTypes.BIGINT_NULLABLE, null, OperandTypes.INTERVALINTERVAL_INTERVALDATETIME, SqlFunctionCategory.SYSTEM); } //~ Methods ---------------------------------------------------------------- @Override public String getSignatureTemplate(int operandsCount) { Util.discard(operandsCount); return "{0}({1} FROM {2})"; } @Override public void unparse( SqlWriter writer, SqlCall call, int leftPrec, int rightPrec) { final SqlWriter.Frame frame = writer.startFunCall(getName()); call.operand(0).unparse(writer, 0, 0); writer.sep("FROM"); call.operand(1).unparse(writer, 0, 0); writer.endFunCall(frame); } @Override public SqlMonotonicity getMonotonicity(SqlOperatorBinding call) { TimeUnitRange value = getOperandLiteralValueOrThrow(call, 0, TimeUnitRange.class); switch (value) { case YEAR: return call.getOperandMonotonicity(1).unstrict(); default: return SqlMonotonicity.NOT_MONOTONIC; } } }




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