Mike Bayer e0396633e7 create second level deduping when use_labels is turned on ...

As of #4753 we allow duplicate columns.  This creates some new
problems that there can be duplicate columns in a subquery
which are then not addressible on the outside because they
are ambiguous (Postgresql has this behavior at least).  Additionally
it creates situations where we are making an anon label of an
anon label which is leaking into the query.

New logic for generating anon labels handles this situation and
also alters the .c collection
of a subquery such that we are only getting the first column
from the derived selectable that has that name, the subsequent ones
have a new deduping label with two underscores and are not exposed
in .c.  The dedupe logic when rendering the columns will handle
duplicate label names for different columns, vs. the same column
repeated, as separate cases.

Fixes: #4892
Change-Id: I929fbd8da14bcc239e0481c24bbd9b5ce826e8fa

2019-10-07 11:26:10 -04:00

..

__init__.py

…

test_case_statement.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_compare.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_compiler.py

create second level deduping when use_labels is turned on

2019-10-07 11:26:10 -04:00

test_constraints.py

Ensure all Index arguments are counted when matching expr/columns

2019-07-24 09:30:57 -04:00

test_cte.py

Allow duplicate columns in from clauses and selectables

2019-07-11 14:20:10 -04:00

test_ddlemit.py

Implement checkfirst for Index.create(), Index.drop()

2019-08-06 23:11:54 -04:00

test_defaults.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_delete.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_deprecations.py

Deprecate textual column matching in Row

2019-10-04 15:58:29 -04:00

test_functions.py

self_group() for FunctionFilter

2019-07-12 22:44:27 -04:00

test_generative.py

Unify generation between Core and ORM query

2019-09-26 11:26:43 -04:00

test_insert_exec.py

Fix typos

2019-07-21 10:51:29 +10:00

test_insert.py

run a black run

2019-03-05 20:29:05 -05:00

test_inspect.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_join_rewriting.py

create second level deduping when use_labels is turned on

2019-10-07 11:26:10 -04:00

test_labels.py

create second level deduping when use_labels is turned on

2019-10-07 11:26:10 -04:00

test_lateral.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_metadata.py

Catch set_parent_w_dispatch missing

2019-09-06 18:43:58 -04:00

test_operators.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_query.py

SelectBase no longer a FromClause

2019-07-06 13:02:22 -04:00

test_quote.py

Modernize internal reflection

2019-08-06 18:05:45 -04:00

test_resultset.py

Deprecate textual column matching in Row

2019-10-04 15:58:29 -04:00

test_returning.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_roles.py

Render LIMIT/OFFSET conditions after compile on select dialects

2019-08-30 17:38:09 -04:00

test_rowcount.py

Post black reformatting

2019-01-06 18:23:11 -05:00

test_selectable.py

create second level deduping when use_labels is turned on

2019-10-07 11:26:10 -04:00

test_tablesample.py

Prevent __init__ from being called for Alias, subclasses

2019-02-21 11:18:19 -05:00

test_text.py

Deprecate textual column matching in Row

2019-10-04 15:58:29 -04:00

test_type_expressions.py

Label simple column transformations as the column name

2019-08-28 17:11:15 -04:00

test_types.py

Render LIMIT/OFFSET conditions after compile on select dialects

2019-08-30 17:38:09 -04:00

test_unicode.py

Post black reformatting

2019-01-06 18:23:11 -05:00

test_update.py

Implement new ClauseElement role and coercion system

2019-05-18 17:46:10 -04:00

test_utils.py

Reimplement .compare() in terms of a visitor

2019-04-29 11:54:25 -04:00