GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/18963
[SPARK-18464][SQL][backport] support old table which doesn't store schema
in table properties
backport https://github.com/apache/spark/pull/18907 to branch 2.2
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark backport
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18963.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18963
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commit 7964c9ad750fc3035042260098616bcc4698e219
Author: Wenchen Fan <[email protected]>
Date: 2017-08-15T16:04:56Z
[SPARK-18464][SQL][FOLLOWUP] support old table which doesn't store schema
in table properties
This is a follow-up of https://github.com/apache/spark/pull/15900 , to fix
one more bug:
When table schema is empty and need to be inferred at runtime, we should
not resolve parent plans before the schema has been inferred, or the parent
plans will be resolved against an empty schema and may get wrong result for
something like `select *`
The fix logic is: introduce `UnresolvedCatalogRelation` as a placeholder.
Then we replace it with `LogicalRelation` or `HiveTableRelation` during
analysis, so that it's guaranteed that we won't resolve parent plans until the
schema has been inferred.
regression test
Author: Wenchen Fan <[email protected]>
Closes #18907 from cloud-fan/bug.
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