ISSUES-2083 fix filter required with union & subquery #2094
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| namespace DB | ||
| { | ||
|
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| class CuttingUnionAllRequiredColumnBlockInputStream : public IProfilingBlockInputStream |
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No comments - don't understand.
| class CuttingUnionAllRequiredColumnBlockInputStream : public IProfilingBlockInputStream | ||
| { | ||
| public: | ||
| CuttingUnionAllRequiredColumnBlockInputStream(const BlockInputStreamPtr input_, const Names & required_columns); |
zhang2014
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| * required_columns : [X,A,X] | ||
| * output_columns : [X,A,X] | ||
| */ | ||
| class CuttingUnionAllRequiredColumnBlockInputStream : public IProfilingBlockInputStream |
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Because Interpreter cannot remove second x of second sub_union_query for
SELECT field_1,field_3,field_4 FROM (SELECT field_1,field_2,field_3,field_4 FROM table_a UNION ALL SELECT X,X,A,X FROM b);
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This reverts commit 36eae15.
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This reverts commit 4755422.
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#2083
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