Gabor Zele created IMPALA-12691:
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Summary: conversion of partial date strings to timestamp
Key: IMPALA-12691
URL: https://issues.apache.org/jira/browse/IMPALA-12691
Project: IMPALA
Issue Type: Improvement
Reporter: Gabor Zele
Currently the TO_TIMESTAMP(STRING date, STRING pattern) function will only
convert a string to timestamp if it has year, month and day parts.
If I'd like to convert a single year or year/month combination:
{noformat}
SELECT
TO_TIMESTAMP('2024-01','yyyy-MM'),
TO_TIMESTAMP('2024','yyyy')
;{noformat}
I always get NULL as result.
To be able to convert these values, especially if there string contains
something else as well, requires regexp_extract() and some other functions to
match the partial format and expand it with "01" as default values for
day/month so CAST/to_timestamp() will work eventually.
If Impala could do the same based on a partial string pattern, then these kind
of conversions would be much simpler and maintainable.
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