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Posted to issues@iceberg.apache.org by GitBox <gi...@apache.org> on 2021/01/20 02:01:57 UTC
[GitHub] [iceberg] rdblue opened a new pull request #2117: Refactor metadata column projection in merge plans
rdblue opened a new pull request #2117:
URL: https://github.com/apache/iceberg/pull/2117
This updates how metadata columns are requested for merge plans. Previously, the merge builder automatically added `_file` and `_pos` metadata columns. But but the left anti join case of `MERGE INTO` uses a non-merge scan. To make the metadata columns available in a more reliable way, this adds `withMetadataColumns` to the Iceberg `ScanBuilder`.
It also adds `ScanBuilderHelper.asIceberg` to get an Iceberg `ScanBuilder` when needed.
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[GitHub] [iceberg] rdblue merged pull request #2117: Refactor metadata column projection in merge plans
Posted by GitBox <gi...@apache.org>.
rdblue merged pull request #2117:
URL: https://github.com/apache/iceberg/pull/2117
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[GitHub] [iceberg] rdblue commented on pull request #2117: Refactor metadata column projection in merge plans
Posted by GitBox <gi...@apache.org>.
rdblue commented on pull request #2117:
URL: https://github.com/apache/iceberg/pull/2117#issuecomment-763275662
This should be helpful when we want to add sort order for `MERGE INTO` plans.
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