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https://issues.apache.org/jira/browse/DRILL-7143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807481#comment-16807481
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ASF GitHub Bot commented on DRILL-7143:
---------------------------------------
paul-rogers commented on pull request #1726: DRILL-7143: Support default value
for empty columns
URL: https://github.com/apache/drill/pull/1726
Modifies the prior work to add default values for columns. The prior work
added defaults
when the entire column is missing from a reader (the old Nullable Int
column). The Row
Set mechanism now will also "fill empty" slots with the default value.
Added default support for the column writers. The writers automatically
obtain the
default value from the column schema. The default can also be set explicitly
on
the column writer.
Updated the null column mechanism to use this feature rather than the ad-hoc
implemention in the prior commit.
Semantics changed a bit. Only Required columns take a default. The default
value
is ignored or nullable columns since nullable columns already have a file
default: NULL.
Updated the CSV-with-schema tests to illustrate the new behavior.
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> Enforce column-level constraints when using a schema
> ----------------------------------------------------
>
> Key: DRILL-7143
> URL: https://issues.apache.org/jira/browse/DRILL-7143
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.16.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Major
> Fix For: 1.16.0
>
>
> The recently added schema framework enforces schema constraints at the table
> level. We now wish to add additional constraints at the column level.
> * If a column is marked as "strict", then the reader will use the exact type
> and mode from the column schema, or fail if it is not possible to do so.
> * If a column is marked as required, and provides a default value, then that
> value is used instead of 0 if a row is missing a value for that column.
> This PR may also contain other fixes the the base functional revealed through
> additional testing.
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