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MCOL-4234: improve GROUP BY and ORDER BY interaction (#3194)

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This patch fixes the problem in MCOL-4234 and also generally improves
behavior of GROUP BY.

It does so by introducing a "dummy" aggregate and by wrapping columns
into it. This allows for columns that are not in GROUP BY to be used
more freely, for example, in SELECT * FROM tbl GROUP BY col - all
columns that are not "col" will be wrapped into an aggregate and query
will proceed to execution.

The dummy aggregate itself does nothing more than remember last value
passed into it.

There also an additional error message that tries to explain what types
of expressions can be wrapped into an aggregate.
This commit is contained in:
Sergey Zefirov
2024-06-17 20:00:54 +03:00
committed by GitHub
parent b1045d27b6
commit 1122b64cb1
16 changed files with 312 additions and 25 deletions
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2
utils/loggingcpp/ErrorMessage.txt
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@ -110,6 +110,8 @@
2061 ERR_MATH_PRODUCES_OUT_OF_RANGE_RESULT %1% value is out of range in '`unk`.`unk`.`unk` %2% `unk`.`unk`.`unk`'
2062 ERR_NOT_SUPPORTED_GROUPBY_ORDERBY_EXPRESSION %1% is not in GROUP BY clause, not a column or an expression that contains function.
# Sub-query errors
3001 ERR_NON_SUPPORT_SUB_QUERY_TYPE This subquery type is not supported yet.
3002 ERR_MORE_THAN_1_ROW Subquery returns more than 1 row.