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[Feature](json_functions) support json-keys (#36411)
support json_keys sql reference MYSQL: https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html#function_json-keys
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84
...e/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/JsonKeys.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.visitor.ExpressionVisitor; | ||
| import org.apache.doris.nereids.types.ArrayType; | ||
| import org.apache.doris.nereids.types.JsonType; | ||
| 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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| /** | ||
| * JsonKeys returns the keys from the top-level value of a JSON object as a JSON array, | ||
| * or, if a path argument is given, the top-level keys from the selected path. | ||
| * Returns NULL if any argument is NULL, the json_doc argument is not an object, | ||
| * or path, if given, does not locate an object. | ||
| * An error occurs if the json_doc argument is not a valid JSON document | ||
| * or the path argument is not a valid path expression. | ||
| */ | ||
| public class JsonKeys extends ScalarFunction | ||
| implements ExplicitlyCastableSignature, AlwaysNullable { | ||
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| public static final List<FunctionSignature> SIGNATURES = ImmutableList.of( | ||
| FunctionSignature.ret(ArrayType.of(StringType.INSTANCE)) | ||
| .args(JsonType.INSTANCE, VarcharType.SYSTEM_DEFAULT), | ||
| FunctionSignature.ret(ArrayType.of(StringType.INSTANCE)).args(JsonType.INSTANCE)); | ||
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| /** | ||
| * constructor with one or two arguments. | ||
| */ | ||
| public JsonKeys(Expression arg0) { | ||
| super("json_keys", arg0); | ||
| } | ||
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| public JsonKeys(Expression arg0, Expression arg1) { | ||
| super("json_keys", arg0, arg1); | ||
| } | ||
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| /** | ||
| * withChildren. | ||
| */ | ||
| @Override | ||
| public JsonKeys withChildren(List<Expression> children) { | ||
| Preconditions.checkArgument(children.size() == 1 || children.size() == 2); | ||
| if (children.size() == 1) { | ||
| return new JsonKeys(children.get(0)); | ||
| } else { | ||
| return new JsonKeys(children.get(0), children.get(1)); | ||
| } | ||
| } | ||
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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.visitJsonKeys(this, context); | ||
| } | ||
| } |
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