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Refactor JSON functions to use parameter array
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core/trino-main/src/main/java/io/trino/operator/scalar/json/ParameterUtil.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Licensed 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 io.trino.operator.scalar.json; | ||
|
|
||
| import com.fasterxml.jackson.databind.node.NullNode; | ||
| import io.trino.json.ir.TypedValue; | ||
| import io.trino.spi.block.Block; | ||
| import io.trino.spi.type.RowType; | ||
| import io.trino.spi.type.Type; | ||
| import io.trino.type.Json2016Type; | ||
|
|
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| import java.util.List; | ||
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| import static io.trino.json.JsonEmptySequenceNode.EMPTY_SEQUENCE; | ||
| import static io.trino.spi.type.TypeUtils.readNativeValue; | ||
| import static io.trino.sql.analyzer.ExpressionAnalyzer.JSON_NO_PARAMETERS_ROW_TYPE; | ||
|
|
||
| public final class ParameterUtil | ||
| { | ||
| private ParameterUtil() {} | ||
|
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| /** | ||
| * Converts the parameters passed to json path into appropriate values, | ||
| * respecting the proper SQL semantics for nulls in the context of | ||
| * a path parameter, and collects them in an array. | ||
| * <p> | ||
| * All non-null values are passed as-is. Conversions apply in the following cases: | ||
| * - null value with FORMAT option is converted into an empty JSON sequence | ||
| * - null value without FORMAT option is converted into a JSON null. | ||
| * | ||
| * @param parametersRowType type of the Block containing parameters | ||
| * @param parametersRow a Block containing parameters | ||
| * @return an array containing the converted values | ||
| */ | ||
| public static Object[] getParametersArray(Type parametersRowType, Object parametersRow) | ||
| { | ||
| if (JSON_NO_PARAMETERS_ROW_TYPE.equals(parametersRowType)) { | ||
| return new Object[] {}; | ||
| } | ||
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|
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| RowType rowType = (RowType) parametersRowType; | ||
| Block row = (Block) parametersRow; | ||
| List<Block> parameterBlocks = row.getChildren(); | ||
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| Object[] array = new Object[rowType.getFields().size()]; | ||
| for (int i = 0; i < rowType.getFields().size(); i++) { | ||
| Type type = rowType.getFields().get(i).getType(); | ||
| Object value = readNativeValue(type, parameterBlocks.get(i), 0); | ||
| if (type.equals(Json2016Type.JSON_2016)) { | ||
| if (value == null) { | ||
| array[i] = EMPTY_SEQUENCE; // null as JSON value shall produce an empty sequence | ||
| } | ||
| else { | ||
| array[i] = value; | ||
| } | ||
| } | ||
| else if (value == null) { | ||
| array[i] = NullNode.getInstance(); // null as a non-JSON value shall produce a JSON null | ||
| } | ||
| else { | ||
| array[i] = TypedValue.fromValueAsObject(type, value); | ||
| } | ||
| } | ||
|
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| return array; | ||
| } | ||
| } |
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