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https://issues.apache.org/jira/browse/DRILL-6768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16656654#comment-16656654
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ASF GitHub Bot commented on DRILL-6768:
---------------------------------------
vdiravka 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_r226594328
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/ExecConstants.java
##########
@@ -456,8 +456,8 @@ private ExecConstants() {
public static final PositiveLongValidator SLICE_TARGET_OPTION = new
PositiveLongValidator(SLICE_TARGET, Long.MAX_VALUE,
new OptionDescription("The number of records manipulated within a
fragment before Drill parallelizes operations."));
- public static final String CAST_TO_NULLABLE_NUMERIC =
"drill.exec.functions.cast_empty_string_to_null";
- public static final BooleanValidator CAST_TO_NULLABLE_NUMERIC_OPTION = new
BooleanValidator(CAST_TO_NULLABLE_NUMERIC,
+ public static final String CAST_EMPTY_STRING_TO_NULL =
"drill.exec.functions.cast_empty_string_to_null";
Review comment:
I see, the output data type could be different, it depends on the function
which was used.
The name is fine. Thanks
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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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