[Coral-Hive] Add missing Hive multi-dimensional aggregation functions: GROUPING_SE… #517
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…TS, ROLLUP, and CUBE
Author
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@wmoustafa Could you help review it? |
wmoustafa
reviewed
Jul 16, 2024
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| import static com.google.common.base.Preconditions.checkState; | ||
| import static java.lang.String.format; | ||
| import static org.apache.calcite.sql.fun.SqlStdOperatorTable.*; |
Contributor
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Let us remove this for consistency with the rest of the file.
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| @Override | ||
| protected SqlNode visitGroupingSets(ASTNode node, ParseContext ctx){ | ||
| // When Hive recognizes a grouping set, it omits the group by node in the constructed AST. |
Contributor
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Nit: GROUP BY for readability here and the rest of the comments.
| @Override | ||
| protected SqlNode visitGroupingSets(ASTNode node, ParseContext ctx){ | ||
| // When Hive recognizes a grouping set, it omits the group by node in the constructed AST. | ||
| // However, Calcite requires the grouping set to be within a group by node when building SqlNode. |
Contributor
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This comment is not very clear. You might depict the structure of the two trees using an example.
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| if(ctx.grpBy == null){ | ||
| ctx.grpBy = new SqlNodeList(new ArrayList<SqlNode>(), ZERO); | ||
| } |
Contributor
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Could you add a similar comment on the relationship between the two representations? Here and in RollUp.
Contributor
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Thanks for the PR. I think it still needs some more work: 1- Conversion from SqlNode to RelNode. |
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…TS, ROLLUP, and CUBE
What changes are proposed in this pull request, and why are they necessary?
Add missing Hive multidimensional aggregation functions (GROUPING SETS, CUBE, ROLLUP) to the coral-hive module.
How was this patch tested?
tested by run unit test