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https://issues.apache.org/jira/browse/FLINK-34938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Wysakowicz closed FLINK-34938.
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Resolution: Fixed
Implemented in 7ea5bcce6a58b69543b571e9746d7374ded028c5
> Incorrect behaviour for comparison functions
> --------------------------------------------
>
> Key: FLINK-34938
> URL: https://issues.apache.org/jira/browse/FLINK-34938
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.19.0
> Reporter: Dawid Wysakowicz
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0
>
>
> There are a few issues with comparison functions.
> Some versions throw:
> {code}
> Incomparable types: TIMESTAMP_LTZ(3) NOT NULL and TIMESTAMP(3)
> {code}
> Results of some depend on the comparison order, because the least restrictive
> precision is not calculated correctly.
> E.g.
> {code}
> final Instant ltz3 = Instant.ofEpochMilli(1_123);
> final Instant ltz0 = Instant.ofEpochMilli(1_000);
> TestSetSpec.forFunction(BuiltInFunctionDefinitions.EQUALS)
> .onFieldsWithData(ltz3, ltz0)
> .andDataTypes(TIMESTAMP_LTZ(3), TIMESTAMP_LTZ(0))
> // compare same type, but different precision, should
> always adjust to the higher precision
> .testResult($("f0").isEqual($("f1")), "f0 = f1",
> false, DataTypes.BOOLEAN())
> .testResult($("f1").isEqual($("f0")), "f1 = f0", true
> /* but should be false */, DataTypes.BOOLEAN())
> {code}
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