GH-49454: [C++][Gandiva] Fix castVARCHAR_timestamp for pre-epoch timestamps#49455
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xxlaykxx
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lriggs
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Rationale for this change
GH-49454 castVARCHAR_timestamp_int64 produces negative milliseconds for pre-epoch timestamps
What changes are included in this PR?
Fixed
castVARCHAR_timestamp_int64to correctly handle pre-epoch timestamps (before 1970-01-01). The issue was that usingin % MILLIS_IN_SECon negative timestamps produces negative milliseconds, resulting in output like"0107-10-17 12:20:03.-10".Are these changes tested?
Yes, added 4 new test cases covering pre-epoch timestamps with milliseconds
Are there any user-facing changes?
This PR contains a "Critical Fix".
This fixes a bug that caused incorrect data to be produced when casting pre-epoch timestamps to VARCHAR in Gandiva. Previously, timestamps before 1970-01-01 with non-zero milliseconds would produce invalid output with negative millisecond values (e.g.,
"0107-10-17 12:20:03.-10"instead of"0107-10-17 12:20:03.900").