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Bug#12363
character_set_results is nullable, but value_ptr returns string "NULL" set_var.cc: Create Item_null instead of Item_string for NULL values variables.result, variables.test: adding test case
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@ -491,3 +491,8 @@ SHOW VARIABLES LIKE 'table_cache';
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Variable_name Value
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table_cache 1
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SET GLOBAL table_cache=DEFAULT;
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set character_set_results=NULL;
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select ifnull(@@character_set_results,"really null");
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ifnull(@@character_set_results,"really null")
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really null
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set names latin1;
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