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https://issues.apache.org/jira/browse/DRILL-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16645081#comment-16645081
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ASF GitHub Bot commented on DRILL-6768:
---------------------------------------
KazydubB commented on a change in pull request #1494: DRILL-6768: Improve
to_date, to_time and to_timestamp and correspondi…
URL: https://github.com/apache/drill/pull/1494#discussion_r223779165
##########
File path: exec/java-exec/src/main/codegen/data/Casts.tdd
##########
@@ -61,10 +61,30 @@
{from: "VarChar", to: "TimeStamp", major: "VarCharDate", alias:
"timestamptype"},
{from: "VarChar", to: "Time", major: "VarCharDate", alias: "timetype"},
+ {from: "VarChar", to: "NullableDate", major:
"EmptyStringVarCharDateComplex"},
+ {from: "VarChar", to: "NullableTimeStamp", major:
"EmptyStringVarCharDateComplex"},
+ {from: "VarChar", to: "NullableTime", major:
"EmptyStringVarCharDateComplex"},
+
+ {from: "NullableVarChar", to: "NullableDate", major:
"EmptyStringVarCharDateComplex"},
+ {from: "NullableVarChar", to: "NullableTimeStamp", major:
"EmptyStringVarCharDateComplex"},
+ {from: "NullableVarChar", to: "NullableTime", major:
"EmptyStringVarCharDateComplex"},
Review comment:
Done.
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> 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.
>
> *For documentation*
> TBA
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