Wenzhe Zhou created IMPALA-10564:
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Summary: No error returned when inserting an overflowed value into
a decimal column
Key: IMPALA-10564
URL: https://issues.apache.org/jira/browse/IMPALA-10564
Project: IMPALA
Issue Type: Bug
Components: Backend, Frontend
Affects Versions: Impala 4.0
Reporter: Wenzhe Zhou
When using CTAS statements or INSERT-SELECT statements to insert rows to table
with decimal columns, Impala insert NULL for overflowed decimal values, instead
of returning error. This issue happens when the data expression for the decimal
column in SELECT sub-query consists at least one alias. This issue is similar
as IMPALA-6340, but IMPALA-6340 only fixed the issue for the cases with the
data expression for the decimal columns as constants so that the overflowed
decimal values could be detected by frontend during expression analysis. If
there is alias (variables) in the data expression for the decimal column,
Frontend could not evaluate data expression in expression analysis phase. Only
backend could evaluate the data expression when backend execute fragment
instances for SELECT sub-queries. The log messages showed that the executor
detected the decimal overflow error, but somehow it did not propagate the error
to the coordinator, hence the error was not returned to the client.
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