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https://issues.apache.org/jira/browse/BEAM-8508?focusedWorklogId=340218&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-340218
]
ASF GitHub Bot logged work on BEAM-8508:
----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Nov/19 23:01
Start Date: 07/Nov/19 23:01
Worklog Time Spent: 10m
Work Description: apilloud commented on pull request #9943: [BEAM-8508]
[SQL] Standalone filter push down
URL: https://github.com/apache/beam/pull/9943#discussion_r343919486
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamPushDownIOSourceRel.java
##########
@@ -0,0 +1,111 @@
+/*
+ * 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 static
org.apache.beam.vendor.calcite.v1_20_0.com.google.common.base.Preconditions.checkArgument;
+
+import java.util.List;
+import java.util.Map;
+import org.apache.beam.sdk.extensions.sql.impl.BeamCalciteTable;
+import org.apache.beam.sdk.extensions.sql.impl.planner.BeamCostModel;
+import org.apache.beam.sdk.extensions.sql.impl.utils.CalciteUtils;
+import org.apache.beam.sdk.extensions.sql.meta.BeamSqlTable;
+import org.apache.beam.sdk.extensions.sql.meta.BeamSqlTableFilter;
+import org.apache.beam.sdk.extensions.sql.meta.DefaultTableFilter;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PCollectionList;
+import org.apache.beam.sdk.values.Row;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptCluster;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptPlanner;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptTable;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelTraitSet;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelWriter;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.metadata.RelMetadataQuery;
+
+public class BeamPushDownIOSourceRel extends BeamIOSourceRel {
+ private final List<String> usedFields;
+ private final BeamSqlTableFilter tableFilters;
+
+ public BeamPushDownIOSourceRel(
+ RelOptCluster cluster,
+ RelTraitSet traitSet,
+ RelOptTable table,
+ BeamSqlTable beamTable,
+ List<String> usedFields,
+ BeamSqlTableFilter tableFilters,
+ Map<String, String> pipelineOptions,
+ BeamCalciteTable calciteTable) {
+ super(cluster, traitSet, table, beamTable, pipelineOptions, calciteTable);
+ this.usedFields = usedFields;
+ this.tableFilters = tableFilters;
+ }
+
+ @Override
+ public RelWriter explainTerms(RelWriter pw) {
+ super.explainTerms(pw);
+
+ // This is done to tell Calcite planner that BeamIOSourceRel cannot be
simply substituted by
+ // another BeamIOSourceRel, except for when they carry the same content.
+ if (!usedFields.isEmpty()) {
+ pw.item("usedFields", usedFields.toString());
+ }
+ if (!(tableFilters instanceof DefaultTableFilter)) {
+ pw.item(tableFilters.getClass().getSimpleName(),
tableFilters.toString());
+ }
+
+ return pw;
+ }
+
+ @Override
+ public PTransform<PCollectionList<Row>, PCollection<Row>> buildPTransform() {
+ return new Transform();
+ }
+
+ private class Transform extends PTransform<PCollectionList<Row>,
PCollection<Row>> {
+
+ @Override
+ public PCollection<Row> expand(PCollectionList<Row> input) {
+ checkArgument(
+ input.size() == 0,
+ "Should not have received input for %s: %s",
+ BeamIOSourceRel.class.getSimpleName(),
+ input);
+
+ final PBegin begin = input.getPipeline().begin();
+ final BeamSqlTable beamSqlTable =
BeamPushDownIOSourceRel.this.getBeamSqlTable();
+
+ if (usedFields.isEmpty() && tableFilters instanceof DefaultTableFilter) {
+ return beamSqlTable.buildIOReader(begin);
+ }
+
+ final Schema newBeamSchema = CalciteUtils.toSchema(getRowType());
+ return beamSqlTable
+ .buildIOReader(begin, tableFilters, usedFields)
+ .setRowSchema(newBeamSchema);
+ }
+ }
+
+ @Override
+ public BeamCostModel beamComputeSelfCost(RelOptPlanner planner,
RelMetadataQuery mq) {
+ return super.beamComputeSelfCost(planner, mq)
+ .multiplyBy((double) 1 / (getRowType().getFieldCount() + 1));
Review comment:
This seems fine for now if tests pass, but this has a very outsized impact
on the cost. I think the impact needs to be less than 1.0, such that two IOs
with different row counts still have the correct relative cost.
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Issue Time Tracking
-------------------
Worklog Id: (was: 340218)
Time Spent: 4h 20m (was: 4h 10m)
> [SQL] Support predicate push-down without project push-down
> -----------------------------------------------------------
>
> Key: BEAM-8508
> URL: https://issues.apache.org/jira/browse/BEAM-8508
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Kirill Kozlov
> Assignee: Kirill Kozlov
> Priority: Major
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> In this PR: [https://github.com/apache/beam/pull/9863]
> Support for Predicate push-down is added, but only for IOs that support
> project push-down.
> In order to accomplish that some checks need to be added to not perform
> certain Calc and IO manipulations when only filter push-down is needed.
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