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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.flink.table.planner.plan.abilities.source;
import org.apache.flink.table.api.TableException;
import org.apache.flink.table.connector.source.DynamicTableSource;
import org.apache.flink.table.connector.source.abilities.SupportsProjectionPushDown;
import org.apache.flink.table.types.logical.RowType;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonCreator;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonTypeName;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* A sub-class of {@link SourceAbilitySpec} that can not only serialize/deserialize the projection
* to/from JSON, but also can push the projection into a {@link SupportsProjectionPushDown}.
*/
@JsonTypeName("ProjectPushDown")
public class ProjectPushDownSpec extends SourceAbilitySpecBase {
public static final String FIELD_NAME_PROJECTED_FIELDS = "projectedFields";
@JsonProperty(FIELD_NAME_PROJECTED_FIELDS)
private final int[][] projectedFields;
@JsonCreator
public ProjectPushDownSpec(
@JsonProperty(FIELD_NAME_PROJECTED_FIELDS) int[][] projectedFields,
@JsonProperty(FIELD_NAME_PRODUCED_TYPE) RowType producedType) {
super(producedType);
this.projectedFields = checkNotNull(projectedFields);
}
@Override
public void apply(DynamicTableSource tableSource, SourceAbilityContext context) {
if (tableSource instanceof SupportsProjectionPushDown) {
((SupportsProjectionPushDown) tableSource).applyProjection(projectedFields);
} else {
throw new TableException(
String.format(
"%s does not support SupportsProjectionPushDown.",
tableSource.getClass().getName()));
}
}
}