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[pick](json-keys) support json_keys function (#38631)

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## Proposed changes
backport: https://github.com/apache/doris/pull/36411
Issue Number: close #xxx

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This commit is contained in:
amory
2024-08-02 19:10:00 +08:00
committed by GitHub
parent 2425730609
commit 556f0fc784
9 changed files with 572 additions and 0 deletions
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2
fe/fe-core/src/main/java/org/apache/doris/catalog/BuiltinScalarFunctions.java
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@ -220,6 +220,7 @@ import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonArray;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonContains;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonExtract;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonInsert;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonKeys;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonLength;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonObject;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonQuote;
@ -709,6 +710,7 @@ public class BuiltinScalarFunctions implements FunctionHelper {
scalar(JsonbType.class, "jsonb_type"),
scalar(JsonLength.class, "json_length"),
scalar(JsonContains.class, "json_contains"),
scalar(JsonKeys.class, "json_keys", "jsonb_keys"),
scalar(L1Distance.class, "l1_distance"),
scalar(L2Distance.class, "l2_distance"),
scalar(LastDay.class, "last_day"),

84
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/scalar/JsonKeys.java Normal file
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@ -0,0 +1,84 @@
// 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.doris.nereids.trees.expressions.functions.scalar;
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;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import java.util.List;
/**
* 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 {
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));
/**
* constructor with one or two arguments.
*/
public JsonKeys(Expression arg0) {
super("json_keys", arg0);
}
public JsonKeys(Expression arg0, Expression arg1) {
super("json_keys", arg0, arg1);
}
/**
* 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));
}
}
@Override
public List<FunctionSignature> getSignatures() {
return SIGNATURES;
}
@Override
public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
return visitor.visitJsonKeys(this, context);
}
}

5
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/visitor/ScalarFunctionVisitor.java
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@ -223,6 +223,7 @@ import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonArray;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonContains;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonExtract;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonInsert;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonKeys;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonLength;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonObject;
import org.apache.doris.nereids.trees.expressions.functions.scalar.JsonQuote;
@ -1308,6 +1309,10 @@ public interface ScalarFunctionVisitor<R, C> {
return visitScalarFunction(jsonExtract, context);
}
default R visitJsonKeys(JsonKeys jsonKeys, C context) {
return visitScalarFunction(jsonKeys, context);
}
default R visitJsonInsert(JsonInsert jsonInsert, C context) {
return visitScalarFunction(jsonInsert, context);
}