GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/2405
[SPARK-2096][SQL] support dot notation on arbitrarily nested array of struct
The rule is simple: If you want `a.b` work, then `a` must be some level of
nested array of struct(level 0 means just a StructType). And the result of
`a.b` is same level of nested array of b-type.
An optimization is: the resolve chain looks like `Attribute -> GetItem ->
GetField -> GetField ...`, so we could transmit the nested array information
between `GetItem` and `GetField` to avoid repeated computation of
`innerDataType` and `containsNullList` of that nested array.
@marmbrus Could you take a look?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark nested-array-dot
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/2405.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 #2405
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commit c42dcc79f5734191edbf4ae3be9609ff0a0b5930
Author: Wenchen Fan <[email protected]>
Date: 2014-09-16T04:26:45Z
support dot notation on nested array
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