| /* |
| * 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.druid.sql.calcite.expression.builtin; |
| |
| 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.druid.query.filter.DimFilter; |
| import org.apache.druid.query.filter.LikeDimFilter; |
| import org.apache.druid.segment.VirtualColumn; |
| import org.apache.druid.segment.column.RowSignature; |
| import org.apache.druid.sql.calcite.expression.DirectOperatorConversion; |
| import org.apache.druid.sql.calcite.expression.DruidExpression; |
| import org.apache.druid.sql.calcite.expression.Expressions; |
| import org.apache.druid.sql.calcite.planner.PlannerContext; |
| import org.apache.druid.sql.calcite.rel.VirtualColumnRegistry; |
| |
| import javax.annotation.Nullable; |
| import java.util.List; |
| |
| public class LikeOperatorConversion extends DirectOperatorConversion |
| { |
| private static final SqlOperator SQL_FUNCTION = SqlStdOperatorTable.LIKE; |
| |
| public LikeOperatorConversion() |
| { |
| super(SQL_FUNCTION, "like"); |
| } |
| |
| @Override |
| public SqlOperator calciteOperator() |
| { |
| return SQL_FUNCTION; |
| } |
| |
| @Nullable |
| @Override |
| public DimFilter toDruidFilter( |
| PlannerContext plannerContext, |
| RowSignature rowSignature, |
| @Nullable VirtualColumnRegistry virtualColumnRegistry, |
| RexNode rexNode |
| ) |
| { |
| final List<RexNode> operands = ((RexCall) rexNode).getOperands(); |
| final DruidExpression druidExpression = Expressions.toDruidExpression( |
| plannerContext, |
| rowSignature, |
| operands.get(0) |
| ); |
| if (druidExpression == null) { |
| return null; |
| } |
| |
| if (druidExpression.isSimpleExtraction()) { |
| return new LikeDimFilter( |
| druidExpression.getSimpleExtraction().getColumn(), |
| RexLiteral.stringValue(operands.get(1)), |
| operands.size() > 2 ? RexLiteral.stringValue(operands.get(2)) : null, |
| druidExpression.getSimpleExtraction().getExtractionFn() |
| ); |
| } else if (virtualColumnRegistry != null) { |
| VirtualColumn v = virtualColumnRegistry.getOrCreateVirtualColumnForExpression( |
| plannerContext, |
| druidExpression, |
| operands.get(0).getType() |
| ); |
| |
| return new LikeDimFilter( |
| v.getOutputName(), |
| RexLiteral.stringValue(operands.get(1)), |
| operands.size() > 2 ? RexLiteral.stringValue(operands.get(2)) : null, |
| null |
| ); |
| } else { |
| return null; |
| } |
| } |
| } |