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MCOL-3464 don't dereference a NULL String.

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This commit is contained in:
David Hall
2020-09-04 16:31:20 -05:00
parent b6e657fa4d
commit 890846fa8a
1 changed files with 2 additions and 1 deletions
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3
dbcon/mysql/ha_mcs_execplan.cpp
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@ -4386,7 +4386,8 @@ SimpleColumn* buildSimpleColumn(Item_field* ifp, gp_walk_info& gwi)
bool isInformationSchema = false;
// @bug5523
if (ifp->cached_table && strcmp(ifp->cached_table->db.str, "information_schema") == 0)
if (ifp->cached_table && ifp->cached_table->db.length > 0
&& strcmp(ifp->cached_table->db.str, "information_schema") == 0)
isInformationSchema = true;
// support FRPM subquery. columns from the derived table has no definition