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https://issues.apache.org/jira/browse/IGNITE-22762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksey Plekhanov resolved IGNITE-22762.
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Fix Version/s: 2.18
Resolution: Fixed
Fixed by IGNITE-24378
> Calcite engine. Validated COALESCE return type not equals to relational
> algebra return type
> -------------------------------------------------------------------------------------------
>
> Key: IGNITE-22762
> URL: https://issues.apache.org/jira/browse/IGNITE-22762
> Project: Ignite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Aleksey Plekhanov
> Priority: Major
> Labels: calcite, ise
> Fix For: 2.18
>
>
> Reproducer:
> {noformat}
> sql("select coalesce(?, 1)", 0);
> {noformat}
> Fails with an exception:
> {noformat}
> java.lang.AssertionError: Conversion to relational algebra failed to preserve
> datatypes:
> validated type:
> RecordType(INTEGER NOT NULL EXPR$0) NOT NULL
> converted type:
> RecordType(INTEGER EXPR$0) NOT NULL
> rel:
> LogicalProject(EXPR$0=[CASE(IS NOT NULL(?0), ?0, 1)])
> LogicalValues(tuples=[[{ 0 }]])
> at
> org.apache.calcite.sql2rel.SqlToRelConverter.checkConvertedType(SqlToRelConverter.java:497)
> ~[calcite-core-1.34.0.jar:1.34.0]
> at
> org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:612)
> ~[calcite-core-1.34.0.jar:1.34.0]
> at
> org.apache.ignite.internal.processors.query.calcite.prepare.IgnitePlanner.rel(IgnitePlanner.java:340)
> ~[classes/:?]
> at
> org.apache.ignite.internal.processors.query.calcite.prepare.PlannerHelper.optimize(PlannerHelper.java:76)
> ~[classes/:?]
> {noformat}
> Root cause: COALESCE converted to CASE operator via
> {{SqlCoalesceFunction#rewriteCall}} method. After convertion each operand is
> cloned (IF IS NOT NULL (op) THEN op), and type is derived for each clone of
> operand individually. These types can be different, and CASE operator can't
> determine that operands are equal, since it has another type (see
> SqlCaseOperator#inferTypeFromValidator and
> SqlCaseOperator#inferTypeFromOperands methods)
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