| /* |
| * 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.adapter.druid; |
| |
| import org.apache.calcite.avatica.util.DateTimeUtils; |
| import org.apache.calcite.avatica.util.TimeUnitRange; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rex.RexCall; |
| import org.apache.calcite.rex.RexLiteral; |
| import org.apache.calcite.rex.RexNode; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.fun.SqlStdOperatorTable; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| |
| import com.google.common.collect.ImmutableMap; |
| |
| import java.util.Map; |
| import java.util.TimeZone; |
| |
| /** |
| * Time extract operator conversion for expressions like |
| * {@code EXTRACT(timeUnit FROM arg)}. |
| * |
| * <p>Unit can be SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), |
| * DOY (day of year), WEEK (week of week year), MONTH (1 through 12), QUARTER (1 |
| * through 4), or YEAR. |
| */ |
| public class ExtractOperatorConversion implements DruidSqlOperatorConverter { |
| private static final Map<TimeUnitRange, String> EXTRACT_UNIT_MAP = |
| ImmutableMap.<TimeUnitRange, String>builder() |
| .put(TimeUnitRange.SECOND, "SECOND") |
| .put(TimeUnitRange.MINUTE, "MINUTE") |
| .put(TimeUnitRange.HOUR, "HOUR") |
| .put(TimeUnitRange.DAY, "DAY") |
| .put(TimeUnitRange.DOW, "DOW") |
| .put(TimeUnitRange.DOY, "DOY") |
| .put(TimeUnitRange.WEEK, "WEEK") |
| .put(TimeUnitRange.MONTH, "MONTH") |
| .put(TimeUnitRange.QUARTER, "QUARTER") |
| .put(TimeUnitRange.YEAR, "YEAR") |
| .build(); |
| |
| @Override public SqlOperator calciteOperator() { |
| return SqlStdOperatorTable.EXTRACT; |
| } |
| |
| @Override public String toDruidExpression( |
| RexNode rexNode, RelDataType rowType, DruidQuery query) { |
| |
| final RexCall call = (RexCall) rexNode; |
| final RexLiteral flag = (RexLiteral) call.getOperands().get(0); |
| final TimeUnitRange calciteUnit = (TimeUnitRange) flag.getValue(); |
| final RexNode arg = call.getOperands().get(1); |
| |
| final String input = DruidExpressions.toDruidExpression(arg, rowType, query); |
| if (input == null) { |
| return null; |
| } |
| |
| final String druidUnit = EXTRACT_UNIT_MAP.get(calciteUnit); |
| if (druidUnit == null) { |
| return null; |
| } |
| |
| final TimeZone tz = |
| arg.getType().getSqlTypeName() == SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE |
| ? TimeZone.getTimeZone(query.getConnectionConfig().timeZone()) |
| : DateTimeUtils.UTC_ZONE; |
| return DruidExpressions.applyTimeExtract(input, druidUnit, tz); |
| } |
| } |