blob: 86f0c2d1d2854cfdd9430756b55a9d006151214e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
|
from sqlglot import exp
def expand_multi_table_selects(expression):
"""
Replace multiple FROM expressions with JOINs.
Example:
>>> from sqlglot import parse_one
>>> expand_multi_table_selects(parse_one("SELECT * FROM x, y")).sql()
'SELECT * FROM x CROSS JOIN y'
"""
for from_ in expression.find_all(exp.From):
parent = from_.parent
for query in from_.expressions[1:]:
parent.join(
query,
join_type="CROSS",
copy=False,
)
from_.expressions.remove(query)
return expression
|
