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Experimental CTE support #223

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Experimental CTE support #223

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13 changes: 13 additions & 0 deletions bin/q.py
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Original file line number Diff line number Diff line change
Expand Up @@ -381,11 +381,19 @@ def __init__(self, sql):

self.query_column_names = None

aliases_to_skip = []

# Go over all sql parts
idx = 0
while idx < len(self.sql_parts):
# Get the part string
part = self.sql_parts[idx]

if part.upper() == 'WITH':
aliases_to_skip.append(self.sql_parts[idx + 1])
idx += 2
continue

# If it's a FROM or a JOIN
if part.upper() in ['FROM', 'JOIN']:
# and there is nothing after it,
Expand All @@ -395,6 +403,11 @@ def __init__(self, sql):
'FROM/JOIN is missing a table name after it')

qtable_name = self.sql_parts[idx + 1]

if qtable_name in aliases_to_skip:
idx += 1
continue

# Otherwise, the next part contains the qtable name. In most cases the next part will be only the qtable name.
# We handle one special case here, where this is a subquery as a column: "SELECT (SELECT ... FROM qtable),100 FROM ...".
# In that case, there will be an ending paranthesis as part of the name, and we want to handle this case gracefully.
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