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Bug#49501 Inefficient information_schema check (system collation)

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added check_length optimization for I_S_NAME comparison
This commit is contained in:
Sergey Glukhov
2010-01-19 13:03:40 +04:00
parent 22cff39274
commit baacdf1dae
9 changed files with 49 additions and 41 deletions
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8
sql/mysql_priv.h
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@ -1415,8 +1415,12 @@ bool get_schema_tables_result(JOIN *join,
enum enum_schema_table_state executed_place);
enum enum_schema_tables get_schema_table_idx(ST_SCHEMA_TABLE *schema_table);
#define is_schema_db(X) \
!my_strcasecmp(system_charset_info, INFORMATION_SCHEMA_NAME.str, (X))
inline bool is_schema_db(const char *name, size_t len)
{
return (INFORMATION_SCHEMA_NAME.length == len &&
!my_strcasecmp(system_charset_info,
INFORMATION_SCHEMA_NAME.str, name));
}
/* sql_prepare.cc */