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https://issues.apache.org/jira/browse/BEAM-3773?focusedWorklogId=94343&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-94343
]
ASF GitHub Bot logged work on BEAM-3773:
----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Apr/18 22:35
Start Date: 23/Apr/18 22:35
Worklog Time Spent: 10m
Work Description: apilloud commented on a change in pull request #5173:
[BEAM-3773][SQL] Add EnumerableConverter for JDBC support
URL: https://github.com/apache/beam/pull/5173#discussion_r183557581
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamEnumerableConverter.java
##########
@@ -0,0 +1,162 @@
+/*
+ * 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.beam.sdk.extensions.sql.impl.rel;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import javax.annotation.Nullable;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.PipelineResult;
+import org.apache.beam.sdk.metrics.Counter;
+import org.apache.beam.sdk.metrics.MetricNameFilter;
+import org.apache.beam.sdk.metrics.MetricQueryResults;
+import org.apache.beam.sdk.metrics.Metrics;
+import org.apache.beam.sdk.metrics.MetricsFilter;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.options.PipelineOptionsFactory;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.values.PCollectionTuple;
+import org.apache.beam.sdk.values.Row;
+import org.apache.calcite.adapter.enumerable.EnumerableRel;
+import org.apache.calcite.adapter.enumerable.EnumerableRelImplementor;
+import org.apache.calcite.adapter.enumerable.PhysType;
+import org.apache.calcite.adapter.enumerable.PhysTypeImpl;
+import org.apache.calcite.linq4j.Enumerable;
+import org.apache.calcite.linq4j.Linq4j;
+import org.apache.calcite.linq4j.tree.BlockBuilder;
+import org.apache.calcite.linq4j.tree.Expression;
+import org.apache.calcite.linq4j.tree.Expressions;
+import org.apache.calcite.plan.ConventionTraitDef;
+import org.apache.calcite.plan.RelOptCluster;
+import org.apache.calcite.plan.RelOptCost;
+import org.apache.calcite.plan.RelOptPlanner;
+import org.apache.calcite.plan.RelTraitSet;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.convert.ConverterImpl;
+import org.apache.calcite.rel.metadata.RelMetadataQuery;
+import org.apache.calcite.rel.type.RelDataType;
+
+/**
+ * BeamRelNode to replace a {@code Enumerable} node.
+ */
+public class BeamEnumerableConverter extends ConverterImpl implements
EnumerableRel {
+
+ public BeamEnumerableConverter(RelOptCluster cluster, RelTraitSet traits,
RelNode input) {
+ super(cluster, ConventionTraitDef.INSTANCE, traits, input);
+ }
+
+ @Override
+ public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
+ return new BeamEnumerableConverter(getCluster(), traitSet, sole(inputs));
+ }
+
+ @Override
+ public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery
mq) {
+ // This should always be a last resort.
+ return planner.getCostFactory().makeHugeCost();
+ }
+
+ @Override
+ public Result implement(EnumerableRelImplementor implementor, Prefer prefer)
{
+ final BlockBuilder list = new BlockBuilder();
+ final RelDataType rowType = getRowType();
+ final PhysType physType =
+ PhysTypeImpl.of(implementor.getTypeFactory(), rowType,
prefer.preferArray());
+ final Expression node = implementor.stash((BeamRelNode) getInput(),
BeamRelNode.class);
+ list.add(Expressions.call(BeamEnumerableConverter.class, "toEnumerable",
node));
+ return implementor.result(physType, list.toBlock());
+ }
+
+ public static Enumerable<Object> toEnumerable(BeamRelNode node) {
+ PipelineOptions options = PipelineOptionsFactory.create();
+ if (node instanceof BeamIOSinkRel) {
+ return count(options, node);
+ }
+ return collect(options, node);
+ }
+
+ private static PipelineResult run(PipelineOptions options, BeamRelNode node,
+ DoFn<Row, Void> doFn) {
+ Pipeline pipeline = Pipeline.create(options);
+ PCollectionTuple.empty(pipeline)
+ .apply(node.toPTransform())
+ .apply(ParDo.of(doFn));
+ PipelineResult result = pipeline.run();
+ result.waitUntilFinish();
Review comment:
This does not work in the general case, it only works on pipelines that
eventually finish. I wanted to get something in for my DDL work, we can make
this better in a followup.
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Issue Time Tracking
-------------------
Worklog Id: (was: 94343)
Time Spent: 4.5h (was: 4h 20m)
> [SQL] Investigate JDBC interface for Beam SQL
> ---------------------------------------------
>
> Key: BEAM-3773
> URL: https://issues.apache.org/jira/browse/BEAM-3773
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Anton Kedin
> Assignee: Andrew Pilloud
> Priority: Major
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> JDBC allows integration with a lot of third-party tools, e.g
> [Zeppelin|https://zeppelin.apache.org/docs/0.7.0/manual/interpreters.html],
> [sqlline|https://github.com/julianhyde/sqlline]. We should look into how
> feasible it is to implement a JDBC interface for Beam SQL
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