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[fix])(function) add function regexp_extract_or_null (#38296)
## Proposed changes Add function regexp_extract_or_null to be compatible with presto. The function is same as regexp_extract, except that it returns null when no match is found.
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73 changes: 73 additions & 0 deletions
73
...java/org/apache/doris/nereids/trees/expressions/functions/scalar/RegexpExtractOrNull.java
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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. | ||
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| package org.apache.doris.nereids.trees.expressions.functions.scalar; | ||
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| import org.apache.doris.catalog.FunctionSignature; | ||
| import org.apache.doris.nereids.trees.expressions.Expression; | ||
| import org.apache.doris.nereids.trees.expressions.functions.AlwaysNullable; | ||
| import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature; | ||
| import org.apache.doris.nereids.trees.expressions.shape.TernaryExpression; | ||
| import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor; | ||
| import org.apache.doris.nereids.types.BigIntType; | ||
| import org.apache.doris.nereids.types.StringType; | ||
| import org.apache.doris.nereids.types.VarcharType; | ||
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| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.ImmutableList; | ||
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| import java.util.List; | ||
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| /** | ||
| * ScalarFunction 'regexp_extract_or_null'. This class is generated by GenerateFunction. | ||
| */ | ||
| public class RegexpExtractOrNull extends ScalarFunction | ||
| implements TernaryExpression, ExplicitlyCastableSignature, AlwaysNullable { | ||
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| public static final List<FunctionSignature> SIGNATURES = ImmutableList.of( | ||
| FunctionSignature.ret(VarcharType.SYSTEM_DEFAULT) | ||
| .args(VarcharType.SYSTEM_DEFAULT, VarcharType.SYSTEM_DEFAULT, BigIntType.INSTANCE), | ||
| FunctionSignature.ret(StringType.INSTANCE) | ||
| .args(StringType.INSTANCE, StringType.INSTANCE, BigIntType.INSTANCE) | ||
| ); | ||
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| /** | ||
| * constructor with 3 arguments. | ||
| */ | ||
| public RegexpExtractOrNull(Expression arg0, Expression arg1, Expression arg2) { | ||
| super("regexp_extract_or_null", arg0, arg1, arg2); | ||
| } | ||
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| /** | ||
| * withChildren. | ||
| */ | ||
| @Override | ||
| public RegexpExtractOrNull withChildren(List<Expression> children) { | ||
| Preconditions.checkArgument(children.size() == 3); | ||
| return new RegexpExtractOrNull(children.get(0), children.get(1), children.get(2)); | ||
| } | ||
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| @Override | ||
| public List<FunctionSignature> getSignatures() { | ||
| return SIGNATURES; | ||
| } | ||
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| @Override | ||
| public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) { | ||
| return visitor.visitRegexpExtractOrNull(this, context); | ||
| } | ||
| } |
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| -- !sql -- | ||
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| -- !sql -- | ||
| \N | ||
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| -- !sql -- | ||
| ['18','17'] | ||
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