io.trino.operator.table.json.execution.SequenceEvaluator Maven / Gradle / Ivy

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/*
 * 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.table.json.execution;

import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.collect.ImmutableList;
import io.trino.json.JsonPathEvaluator;
import io.trino.json.PathEvaluationException;
import io.trino.json.ir.TypedValue;
import io.trino.operator.scalar.json.JsonOutputConversionException;

import java.util.List;
import java.util.Optional;

import static com.google.common.base.Preconditions.checkState;
import static io.trino.json.JsonInputErrorNode.JSON_ERROR;
import static io.trino.json.ir.SqlJsonLiteralConverter.getJsonNode;
import static java.lang.String.format;

public class SequenceEvaluator
{
    private SequenceEvaluator()
    {
    }

    // creates a sequence of JSON items, and applies error handling
    public static List getSequence(JsonNode item, Object[] pathParameters, JsonPathEvaluator pathEvaluator, boolean errorOnError)
    {
        if (item == null) {
            // According to ISO/IEC 9075-2:2016(E) 7.11  p.461 General rules 1) a) empty table should be returned for null input. Empty sequence will result in an empty table.
            return ImmutableList.of();
        }
        // According to ISO/IEC 9075-2:2016(E) 7.11  p.461 General rules 1) e) exception thrown by path evaluation should be handled accordingly to json_table error behavior (ERROR or EMPTY).
        // handle input conversion error for the context item
        if (item.equals(JSON_ERROR)) {
            checkState(!errorOnError, "input conversion error should have been thrown in the input function");
            // the error behavior is EMPTY ON ERROR. Empty sequence will result in an empty table.
            return ImmutableList.of();
        }
        // handle input conversion error for the path parameters
        for (Object parameter : pathParameters) {
            if (parameter.equals(JSON_ERROR)) {
                checkState(!errorOnError, "input conversion error should have been thrown in the input function");
                // the error behavior is EMPTY ON ERROR. Empty sequence will result in an empty table.
                return ImmutableList.of();
            }
        }
        // evaluate path into a sequence
        List