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Diffstat (limited to 'lib/sqlalchemy/dialects/mysql/base.py')
| -rw-r--r-- | lib/sqlalchemy/dialects/mysql/base.py | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/sqlalchemy/dialects/mysql/base.py b/lib/sqlalchemy/dialects/mysql/base.py index 45e8c2510..43966d1dc 100644 --- a/lib/sqlalchemy/dialects/mysql/base.py +++ b/lib/sqlalchemy/dialects/mysql/base.py @@ -1179,8 +1179,18 @@ class MySQLCompiler(compiler.SQLCompiler): fromhints=from_hints, **kw) for t in [from_table] + extra_froms) - def visit_empty_set_expr(self, type_): - return 'SELECT 1 FROM (SELECT 1) as _empty_set WHERE 1!=1' + def visit_empty_set_expr(self, element_types): + return ( + "SELECT %(outer)s FROM (SELECT %(inner)s) " + "as _empty_set WHERE 1!=1" % { + "inner": ", ".join( + "1 AS _in_%s" % idx + for idx, type_ in enumerate(element_types)), + "outer": ", ".join( + "_in_%s" % idx + for idx, type_ in enumerate(element_types)) + } + ) class MySQLDDLCompiler(compiler.DDLCompiler): |