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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:
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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|
CAST empty string to null (in case of enabled option) will be supported by
DATE, TIME, TIMESTAMP, INTERVAL YEAR, INTERVAL MONTH and INTERVAL DAY functions
in addition to numeric types.
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 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|
> 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
> Affects Versions: 1.14.0
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.15.0
>
>
> 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|
> CAST empty string to null (in case of enabled option) will be supported by
> DATE, TIME, TIMESTAMP, INTERVAL YEAR, INTERVAL MONTH and INTERVAL DAY
> functions in addition to numeric types.
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