[SPARK-11319][SQL] Making StructField's nullable field documentation clearer #11785
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Can one of the admins verify this patch? |
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👍Agreed, it's very confusing. |
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I would love for this to be a constraint. |
| @@ -24,7 +24,9 @@ import org.json4s.JsonDSL._ | |||
| * A field inside a StructType. | |||
| * @param name The name of this field. | |||
| * @param dataType The data type of this field. | |||
| * @param nullable Indicates if values of this field can be `null` values. | |||
| * @param nullable Indicates if values of this field can be `null` values. Note that this is ONLY A HINT to the | |||
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According to @marmbrus's comment here this is actually much stronger than a hint:
Fair, this is a contract with the optimizer that you will not produce null data. If you are not certain you will not produce null values then set this to true.
maropu
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Apr 23, 2017
Closes apache#11785 Closes apache#13027 Closes apache#13614 Closes apache#13761 Closes apache#15197 Closes apache#14006 Closes apache#12576 Closes apache#15447 Closes apache#13259 Closes apache#15616 Closes apache#14473 Closes apache#16638 Closes apache#16146 Closes apache#17269 Closes apache#17313 Closes apache#17418 Closes apache#17485 Closes apache#17551 Closes apache#17463 Closes apache#17625 Closes apache#10739 Closes apache#15193 Closes apache#15344 Closes apache#14804 Closes apache#16993 Closes apache#17040 Closes apache#15180 Closes apache#17238
peter-toth
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Oct 6, 2018
This pr proposed to close stale PRs. Currently, we have 400+ open PRs and there are some stale PRs whose JIRA tickets have been already closed and whose JIRA tickets does not exist (also, they seem not to be minor issues). // Open PRs whose JIRA tickets have been already closed Closes apache#11785 Closes apache#13027 Closes apache#13614 Closes apache#13761 Closes apache#15197 Closes apache#14006 Closes apache#12576 Closes apache#15447 Closes apache#13259 Closes apache#15616 Closes apache#14473 Closes apache#16638 Closes apache#16146 Closes apache#17269 Closes apache#17313 Closes apache#17418 Closes apache#17485 Closes apache#17551 Closes apache#17463 Closes apache#17625 // Open PRs whose JIRA tickets does not exist and they are not minor issues Closes apache#10739 Closes apache#15193 Closes apache#15344 Closes apache#14804 Closes apache#16993 Closes apache#17040 Closes apache#15180 Closes apache#17238 N/A Author: Takeshi Yamamuro <yamamuro@apache.org> Closes apache#17734 from maropu/resolved_pr. Change-Id: Id2e590aa7283fe5ac01424d30a40df06da6098b5
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What changes were proposed in this pull request?
Be more descriptive in what the nullable field of StructField is intended for. At the moment, the description does not explain that it's only a hint to the optimizer, and many people are mistakenly thinking that this is a "NOT NULL" type constraint. Making it clear in the doc should help people understand its purpose.
How was this patch tested?
Not tested as it's only documentation