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https://issues.apache.org/jira/browse/CALCITE-7766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7766:
------------------------------------
Labels: pull-request-available (was: )
> Type-mismatch on nullability in JoinPushTransitivePredicatesRule for RIGHT
> join
> -------------------------------------------------------------------------------
>
> Key: CALCITE-7766
> URL: https://issues.apache.org/jira/browse/CALCITE-7766
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Ilya Korol
> Priority: Major
> Labels: pull-request-available
>
> CALCITE-5387 fixed the same failure for INNER and LEFT joins only, but for
> RIGHT joins issues is still there. For example the following query fails
> under assertions:
> {code:sql}
> WITH
> non_null_table AS (
> SELECT DATE '2023-08-07' AS date_col_non_null FROM dept
> ),
> null_table AS (
> SELECT CAST(null as DATE) AS date_col_null FROM dept
> )
> SELECT *
> FROM null_table
> RIGHT JOIN non_null_table
> ON null_table.date_col_null = non_null_table.date_col_non_null
> {code}
> {noformat}
> java.lang.AssertionError: type mismatch:
> ref:
> DATE NOT NULL
> input:
> DATE
> at
> org.apache.calcite.plan.RelOptUtil.eqUpToNullability(RelOptUtil.java:2279)
> at org.apache.calcite.rex.RexChecker.visitInputRef(RexChecker.java:131)
> at org.apache.calcite.rel.core.Filter.isValid(Filter.java:165)
> at
> org.apache.calcite.rel.logical.LogicalFilter.create(LogicalFilter.java:141)
> at org.apache.calcite.tools.RelBuilder.filter(RelBuilder.java:1965)
> at
> org.apache.calcite.rel.rules.JoinPushTransitivePredicatesRule.onMatch(JoinPushTransitivePredicatesRule.java:88)
> {noformat}
> CALCITE-5387 made a targeted fix in `RexPermuteInputsShuttle` that adjusts
> input ref type:
> {code:java}
> @Override public RexNode visitInputRef(RexInputRef local) {
> final int index = local.getIndex();
> int target = mapping.getTarget(index);
> if (!matchTargetType) {
> return new RexInputRef(
> target,
> local.getType());
> } else {
> return new RexInputRef(
> target,
> fields.get(target).getType());
> }
> }
> {code}
> but permutation outcome were not applied to RIGHT join at the first place. As
> far as I can guess results of permutation for RIGHT join are the same and
> EMPTY_LIST shortcut was used instead:
> {code:java}
> case LEFT:
> case ANTI:
> return RelOptPredicateList.of(rexBuilder,
> RelOptUtil.conjunctions(leftChildPredicates),
> leftInferredPredicates, rightInferredPredicates);
> case RIGHT:
> return RelOptPredicateList.of(rexBuilder,
> RelOptUtil.conjunctions(rightChildPredicates),
> inferredPredicates, EMPTY_LIST); <------------------
> {code}
> so as a result RIGHT joins were out of C5387 scope
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