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https://issues.apache.org/jira/browse/DRILL-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bohdan Kazydub updated DRILL-6768:
----------------------------------
Description:
When `drill.exec.functions.cast_empty_string_to_null` option is enabled
`to_date`, `to_time` and `to_timestamp` functions while converting string to
according type in case if null or empty string values are passed will return
NULL (to avoid CASE clauses which are littering a query and will work in
accordance with their respective CAST counterparts) for both cases.
CASTs will be handled in a similar way (uniformly with numeric types):
||Value to cast||Now||Will be||
|NULL|NULL|NULL|
|'' (empty string)|Error in many cases (except numerical types)|NULL|
was:
When `drill.exec.functions.cast_empty_string_to_null` option is enabled
`to_date`, `to_time` and `to_timestamp` functions while converting string to
according type in case if null or empty string values are passed will return
NULL (to avoid CASE clauses which are littering a query and will work uniformly
with numeric types) for both cases.
CASTs will be handled in a similar way:
||Value to cast||Now||Will be||
|NULL|NULL|NULL|
|'' (empty string)|Error in many cases (except numerical types)|NULL|
> Improve to_date, to_time and to_timestamp and corresponding cast functions to
> handle empty string when `drill.exec.functions.cast_empty_string_to_null`
> option is enabled
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-6768
> URL: https://issues.apache.org/jira/browse/DRILL-6768
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Minor
>
> When `drill.exec.functions.cast_empty_string_to_null` option is enabled
> `to_date`, `to_time` and `to_timestamp` functions while converting string to
> according type in case if null or empty string values are passed will return
> NULL (to avoid CASE clauses which are littering a query and will work in
> accordance with their respective CAST counterparts) for both cases.
>
>
>
> CASTs will be handled in a similar way (uniformly with numeric types):
>
> ||Value to cast||Now||Will be||
> |NULL|NULL|NULL|
> |'' (empty string)|Error in many cases (except numerical types)|NULL|
>
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