hailong wang created FLINK-19659:
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Summary: Array type supports equals and not_equals operator when
element types are different but castable
Key: FLINK-19659
URL: https://issues.apache.org/jira/browse/FLINK-19659
Project: Flink
Issue Type: New Feature
Components: Table SQL / Planner
Affects Versions: 1.11.0
Reporter: hailong wang
Currently, Array type supports `equals` and `not_equals` when element is the
same or can not be cased. For example,
{code:java}
Array[1] <> Array[1] -> true{code}
{code:java}
Array[1] <> Array[cast(x'01' as binary)] -> false
{code}
But for the element types which are castable, it will throw error,
{code:java}
org.apache.flink.table.planner.codegen.CodeGenException: Unsupported cast from
'ARRAY<INT NOT NULL> NOT NULL' to 'ARRAY<BIGINT NOT NULL> NOT
NULL'.org.apache.flink.table.planner.codegen.CodeGenException: Unsupported cast
from 'ARRAY<INT NOT NULL> NOT NULL' to 'ARRAY<BIGINT NOT NULL> NOT NULL'. at
org.apache.flink.table.planner.codegen.calls.ScalarOperatorGens$.generateCast(ScalarOperatorGens.scala:1295)
at
org.apache.flink.table.planner.codegen.ExprCodeGenerator.generateCallExpression(ExprCodeGenerator.scala:703)
at
org.apache.flink.table.planner.codegen.ExprCodeGenerator.visitCall(ExprCodeGenerator.scala:498)
at
org.apache.flink.table.planner.codegen.ExprCodeGenerator.visitCall(ExprCodeGenerator.scala:55)
at org.apache.calcite.rex.RexCall.accept(RexCall.java:288){code}
But the result should be false or true, for example,
{code:java}
/Array[1] <> Array[cast(1 as bigint)] -> true
{code}
BTW, Map and MultiSet type are same as this, If it did, I am pleasure to open
other issue to track those.
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