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Issue ----- This problem occurs when varchar columns are used in a internal temporary table. The type of the field is set incorrectly to the generic FIELD_NORMAL type. This in turn results in an inaccurate calculation of the record length. Valgrind issues will occur since initialization has not happend for some bytes. Fix ---- While creating the temporary table, the type of the field needs to be to set FIELD_VARCHAR. This will allow myisam to calculate the record length accurately. This fix is a backport of BUG#13350136. |
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