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Do not create histograms for single column unique key

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The intentention was always to not create histograms for single value
unique keys (as histograms is not useful in this case), but because of
a bug in the code this was still done.

The changes in the test cases was mainly because hist_size is now NULL
for these kind of columns.
This commit is contained in:
Monty
2023-10-14 13:43:26 +03:00
parent 18fa00a54c
commit ec277a70e8
4 changed files with 41 additions and 41 deletions
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sql/sql_statistics.cc
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@@ -2345,7 +2345,7 @@ void Column_statistics_collected::init(THD *thd, Field *table_field)
column_total_length= 0;
if (is_single_pk_col)
count_distinct= NULL;
if (table_field->flags & BLOB_FLAG)
else if (table_field->flags & BLOB_FLAG)
count_distinct= NULL;
else
{