Alex Behm has uploaded a new patch set (#6). Change subject: IMPALA-4309: Introduce Expr rewrite phase and supporting classes. ......................................................................
IMPALA-4309: Introduce Expr rewrite phase and supporting classes. Introduces a new phase for rewriting Exprs after analysis and before subquery rewriting. The transformed Exprs replace the original ones in analyzed statements. If Exprs were changed, the whole statement is reset() and re-analyzed, similar to how subqueries are rewritten. If both Exprs and subqueries are rewritten there is only one re-analysis of the changed statement. The following new classes work together to perform transformations: 1. ExprRewriteRule - base class for Expr transformation rules 2. ExprRewriter - drives the transformation of Exprs using a list of ExprRewriteRules Statements that have exprs to be rewritten need to implement a new method rewriteExprs() that accepts an ExprRewriter. As an example, this patch adds a rule for converting BetweenPredicates into their equivalent CompoundPredicates. The BetweenPredicate has been notoriously buggy due to a lack of such a separate rewrite phase and is now cleaned up. Testing: 1. Added a new test for checking that the rewrite framework covers all relevant statements, clauses and can properly handle nested statements and subqueries. 2. There are many existing tests for BetweePredicates and they all exercise the new rewrite rule/phase. 3. Ran a private core/hdfs run and it passed. Change-Id: I2279dc984bcf7742db4fa3b1aa67283ecbb05e6e --- M fe/src/main/java/org/apache/impala/analysis/AnalysisContext.java M fe/src/main/java/org/apache/impala/analysis/Analyzer.java M fe/src/main/java/org/apache/impala/analysis/BetweenPredicate.java M fe/src/main/java/org/apache/impala/analysis/CreateOrAlterViewStmtBase.java M fe/src/main/java/org/apache/impala/analysis/CreateTableAsSelectStmt.java M fe/src/main/java/org/apache/impala/analysis/InlineViewRef.java M fe/src/main/java/org/apache/impala/analysis/InsertStmt.java M fe/src/main/java/org/apache/impala/analysis/ModifyStmt.java M fe/src/main/java/org/apache/impala/analysis/SelectList.java M fe/src/main/java/org/apache/impala/analysis/SelectListItem.java M fe/src/main/java/org/apache/impala/analysis/SelectStmt.java M fe/src/main/java/org/apache/impala/analysis/StatementBase.java M fe/src/main/java/org/apache/impala/analysis/StmtRewriter.java M fe/src/main/java/org/apache/impala/analysis/TableRef.java M fe/src/main/java/org/apache/impala/analysis/UnionStmt.java M fe/src/main/java/org/apache/impala/planner/HdfsPartitionPruner.java M fe/src/main/java/org/apache/impala/planner/PlanNode.java A fe/src/main/java/org/apache/impala/rewrite/BetweenToCompoundRule.java A fe/src/main/java/org/apache/impala/rewrite/ExprRewriteRule.java A fe/src/main/java/org/apache/impala/rewrite/ExprRewriter.java M fe/src/test/java/org/apache/impala/analysis/AnalyzeStmtsTest.java M fe/src/test/java/org/apache/impala/analysis/AnalyzeSubqueriesTest.java A fe/src/test/java/org/apache/impala/analysis/ExprRewriteRulesTest.java M fe/src/test/java/org/apache/impala/common/FrontendTestBase.java M testdata/workloads/functional-planner/queries/PlannerTest/tpcds-all.test M testdata/workloads/functional-planner/queries/PlannerTest/tpch-all.test M testdata/workloads/functional-planner/queries/PlannerTest/tpch-kudu.test M testdata/workloads/functional-planner/queries/PlannerTest/tpch-nested.test M testdata/workloads/functional-planner/queries/PlannerTest/tpch-views.test 29 files changed, 513 insertions(+), 216 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/46/4746/6 -- To view, visit http://gerrit.cloudera.org:8080/4746 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: I2279dc984bcf7742db4fa3b1aa67283ecbb05e6e Gerrit-PatchSet: 6 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Alex Behm <alex.b...@cloudera.com> Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com> Gerrit-Reviewer: Bharath Vissapragada <bhara...@cloudera.com> Gerrit-Reviewer: Dimitris Tsirogiannis <dtsirogian...@cloudera.com> Gerrit-Reviewer: Marcel Kornacker <mar...@cloudera.com> Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
