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Commit e635cbb6 authored by jiangxingbo's avatar jiangxingbo Committed by Wenchen Fan
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[SPARK-18801][SQL][FOLLOWUP] Alias the view with its child

## What changes were proposed in this pull request?

This PR is a follow-up to address the comments https://github.com/apache/spark/pull/16233/files#r95669988 and https://github.com/apache/spark/pull/16233/files#r95662299.

We try to wrap the child by:
1. Generate the `queryOutput` by:
    1.1. If the query column names are defined, map the column names to attributes in the child output by name;
    1.2. Else set the child output attributes to `queryOutput`.
2. Map the `queryQutput` to view output by index, if the corresponding attributes don't match, try to up cast and alias the attribute in `queryOutput` to the attribute in the view output.
3. Add a Project over the child, with the new output generated by the previous steps.
If the view output doesn't have the same number of columns neither with the child output, nor with the query column names, throw an AnalysisException.

## How was this patch tested?

Add new test cases in `SQLViewSuite`.

Author: jiangxingbo <jiangxb1987@gmail.com>

Closes #16561 from jiangxb1987/alias-view.
parent 61e48f52
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