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MDEV-14695: Assertion `n < m_size' failed in Bounds_checked_array<Element_type>::operator

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In this issue we hit the assert because we are adding addition fields to the field JOIN::all_fields list. This
is done because  HEAP tables can't index BIT fields so  we need to use an additional hidden field for grouping because later it will be
converted to a LONG field. Original field will remain of the BIT type and will be returned. This happens when we convert DISTINCT to
GROUP BY.

The solution is to take into account the number of such hidden fields that would be added to the field
JOIN::all_fields list while calculating the size of the ref_pointer_array.
This commit is contained in:
Varun Gupta
2018-05-15 01:44:03 +05:30
parent d9f9cd1a10
commit 6f4534e622
9 changed files with 45 additions and 8 deletions
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5
sql/sql_lex.h
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@ -862,6 +862,11 @@ public:
uint select_n_where_fields;
/* reserved for exists 2 in */
uint select_n_reserved;
/*
it counts the number of bit fields in the SELECT list. These are used when DISTINCT is
converted to a GROUP BY involving BIT fields.
*/
uint hidden_bit_fields;
enum_parsing_place parsing_place; /* where we are parsing expression */
enum_parsing_place context_analysis_place; /* where we are in prepare */
bool with_sum_func; /* sum function indicator */