-
Notifications
You must be signed in to change notification settings - Fork 28.5k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[SPARK-12957][SQL] Initial support for constraint propagation in Spar…
…kSQL Based on the semantics of a query, we can derive a number of data constraints on output of each (logical or physical) operator. For instance, if a filter defines `‘a > 10`, we know that the output data of this filter satisfies 2 constraints: 1. `‘a > 10` 2. `isNotNull(‘a)` This PR proposes a possible way of keeping track of these constraints and propagating them in the logical plan, which can then help us build more advanced optimizations (such as pruning redundant filters, optimizing joins, among others). We define constraints as a set of (implicitly conjunctive) expressions. For e.g., if a filter operator has constraints = `Set(‘a > 10, ‘b < 100)`, it’s implied that the outputs satisfy both individual constraints (i.e., `‘a > 10` AND `‘b < 100`). Design Document: https://docs.google.com/a/databricks.com/document/d/1WQRgDurUBV9Y6CWOBS75PQIqJwT-6WftVa18xzm7nCo/edit?usp=sharing Author: Sameer Agarwal <[email protected]> Closes #10844 from sameeragarwal/constraints.
- Loading branch information
1 parent
e86f8f6
commit 138c300
Showing
4 changed files
with
302 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
173 changes: 173 additions & 0 deletions
173
...alyst/src/test/scala/org/apache/spark/sql/catalyst/plans/ConstraintPropagationSuite.scala
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| /* | ||
| * 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.spark.sql.catalyst.plans | ||
|
|
||
| import org.apache.spark.SparkFunSuite | ||
| import org.apache.spark.sql.catalyst.analysis._ | ||
| import org.apache.spark.sql.catalyst.dsl.expressions._ | ||
| import org.apache.spark.sql.catalyst.dsl.plans._ | ||
| import org.apache.spark.sql.catalyst.expressions._ | ||
| import org.apache.spark.sql.catalyst.plans.logical._ | ||
|
|
||
| class ConstraintPropagationSuite extends SparkFunSuite { | ||
|
|
||
| private def resolveColumn(tr: LocalRelation, columnName: String): Expression = | ||
| tr.analyze.resolveQuoted(columnName, caseInsensitiveResolution).get | ||
|
|
||
| private def verifyConstraints(found: Set[Expression], expected: Set[Expression]): Unit = { | ||
| val missing = expected.filterNot(i => found.map(_.semanticEquals(i)).reduce(_ || _)) | ||
| val extra = found.filterNot(i => expected.map(_.semanticEquals(i)).reduce(_ || _)) | ||
| if (missing.nonEmpty || extra.nonEmpty) { | ||
| fail( | ||
| s""" | ||
| |== FAIL: Constraints do not match === | ||
| |Found: ${found.mkString(",")} | ||
| |Expected: ${expected.mkString(",")} | ||
| |== Result == | ||
| |Missing: ${if (missing.isEmpty) "N/A" else missing.mkString(",")} | ||
| |Found but not expected: ${if (extra.isEmpty) "N/A" else extra.mkString(",")} | ||
| """.stripMargin) | ||
| } | ||
| } | ||
|
|
||
| test("propagating constraints in filters") { | ||
| val tr = LocalRelation('a.int, 'b.string, 'c.int) | ||
|
|
||
| assert(tr.analyze.constraints.isEmpty) | ||
|
|
||
| assert(tr.where('a.attr > 10).select('c.attr, 'b.attr).analyze.constraints.isEmpty) | ||
|
|
||
| verifyConstraints(tr | ||
| .where('a.attr > 10) | ||
| .analyze.constraints, | ||
| Set(resolveColumn(tr, "a") > 10, | ||
| IsNotNull(resolveColumn(tr, "a")))) | ||
|
|
||
| verifyConstraints(tr | ||
| .where('a.attr > 10) | ||
| .select('c.attr, 'a.attr) | ||
| .where('c.attr < 100) | ||
| .analyze.constraints, | ||
| Set(resolveColumn(tr, "a") > 10, | ||
| resolveColumn(tr, "c") < 100, | ||
| IsNotNull(resolveColumn(tr, "a")), | ||
| IsNotNull(resolveColumn(tr, "c")))) | ||
| } | ||
|
|
||
| test("propagating constraints in union") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int) | ||
| val tr2 = LocalRelation('d.int, 'e.int, 'f.int) | ||
| val tr3 = LocalRelation('g.int, 'h.int, 'i.int) | ||
|
|
||
| assert(tr1 | ||
| .where('a.attr > 10) | ||
| .unionAll(tr2.where('e.attr > 10) | ||
| .unionAll(tr3.where('i.attr > 10))) | ||
| .analyze.constraints.isEmpty) | ||
|
|
||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .unionAll(tr2.where('d.attr > 10) | ||
| .unionAll(tr3.where('g.attr > 10))) | ||
| .analyze.constraints, | ||
| Set(resolveColumn(tr1, "a") > 10, | ||
| IsNotNull(resolveColumn(tr1, "a")))) | ||
| } | ||
|
|
||
| test("propagating constraints in intersect") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int) | ||
| val tr2 = LocalRelation('a.int, 'b.int, 'c.int) | ||
|
|
||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .intersect(tr2.where('b.attr < 100)) | ||
| .analyze.constraints, | ||
| Set(resolveColumn(tr1, "a") > 10, | ||
| resolveColumn(tr1, "b") < 100, | ||
| IsNotNull(resolveColumn(tr1, "a")), | ||
| IsNotNull(resolveColumn(tr1, "b")))) | ||
| } | ||
|
|
||
| test("propagating constraints in except") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int) | ||
| val tr2 = LocalRelation('a.int, 'b.int, 'c.int) | ||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .except(tr2.where('b.attr < 100)) | ||
| .analyze.constraints, | ||
| Set(resolveColumn(tr1, "a") > 10, | ||
| IsNotNull(resolveColumn(tr1, "a")))) | ||
| } | ||
|
|
||
| test("propagating constraints in inner join") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int).subquery('tr1) | ||
| val tr2 = LocalRelation('a.int, 'd.int, 'e.int).subquery('tr2) | ||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .join(tr2.where('d.attr < 100), Inner, Some("tr1.a".attr === "tr2.a".attr)) | ||
| .analyze.constraints, | ||
| Set(tr1.resolveQuoted("a", caseInsensitiveResolution).get > 10, | ||
| tr2.resolveQuoted("d", caseInsensitiveResolution).get < 100, | ||
| tr1.resolveQuoted("a", caseInsensitiveResolution).get === | ||
| tr2.resolveQuoted("a", caseInsensitiveResolution).get, | ||
| IsNotNull(tr2.resolveQuoted("a", caseInsensitiveResolution).get), | ||
| IsNotNull(tr1.resolveQuoted("a", caseInsensitiveResolution).get), | ||
| IsNotNull(tr2.resolveQuoted("d", caseInsensitiveResolution).get))) | ||
| } | ||
|
|
||
| test("propagating constraints in left-semi join") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int).subquery('tr1) | ||
| val tr2 = LocalRelation('a.int, 'd.int, 'e.int).subquery('tr2) | ||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .join(tr2.where('d.attr < 100), LeftSemi, Some("tr1.a".attr === "tr2.a".attr)) | ||
| .analyze.constraints, | ||
| Set(tr1.resolveQuoted("a", caseInsensitiveResolution).get > 10, | ||
| IsNotNull(tr1.resolveQuoted("a", caseInsensitiveResolution).get))) | ||
| } | ||
|
|
||
| test("propagating constraints in left-outer join") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int).subquery('tr1) | ||
| val tr2 = LocalRelation('a.int, 'd.int, 'e.int).subquery('tr2) | ||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .join(tr2.where('d.attr < 100), LeftOuter, Some("tr1.a".attr === "tr2.a".attr)) | ||
| .analyze.constraints, | ||
| Set(tr1.resolveQuoted("a", caseInsensitiveResolution).get > 10, | ||
| IsNotNull(tr1.resolveQuoted("a", caseInsensitiveResolution).get))) | ||
| } | ||
|
|
||
| test("propagating constraints in right-outer join") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int).subquery('tr1) | ||
| val tr2 = LocalRelation('a.int, 'd.int, 'e.int).subquery('tr2) | ||
| verifyConstraints(tr1 | ||
| .where('a.attr > 10) | ||
| .join(tr2.where('d.attr < 100), RightOuter, Some("tr1.a".attr === "tr2.a".attr)) | ||
| .analyze.constraints, | ||
| Set(tr2.resolveQuoted("d", caseInsensitiveResolution).get < 100, | ||
| IsNotNull(tr2.resolveQuoted("d", caseInsensitiveResolution).get))) | ||
| } | ||
|
|
||
| test("propagating constraints in full-outer join") { | ||
| val tr1 = LocalRelation('a.int, 'b.int, 'c.int).subquery('tr1) | ||
| val tr2 = LocalRelation('a.int, 'd.int, 'e.int).subquery('tr2) | ||
| assert(tr1.where('a.attr > 10) | ||
| .join(tr2.where('d.attr < 100), FullOuter, Some("tr1.a".attr === "tr2.a".attr)) | ||
| .analyze.constraints.isEmpty) | ||
| } | ||
| } |