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sqlalchemy/test/sql/test_labels.py
T
Mike Bayer 707e5d70fc labeling refactor 
To service #6718 and #6710, the system by which columns are
given labels in a SELECT statement as well as the system that
gives them keys in a .c or .selected_columns collection have
been refactored to provide a single source of truth for
both, in constrast to the previous approach that included
similar logic repeated in slightly different ways.

Main ideas:

1. ColumnElement attributes ._label, ._anon_label, ._key_label
   are renamed to include the letters "tq", meaning
   "table-qualified" - these labels are only used when rendering
   a SELECT that has LABEL_STYLE_TABLENAME_PLUS_COL for its
   label style; as this label style is primarily legacy, the
   "tq" names should be isolated so that in a 2.0 style application
   these aren't being used at all

2. The means by which the "labels" and "proxy keys" for the elements
   of a SELECT has been centralized to a single source of truth;
   previously, the three of _generate_columns_plus_names,
   _generate_fromclause_column_proxies, and _column_naming_convention
   all had duplicated rules between them, as well as that there
   were a little bit of labeling rules in compiler._label_select_column
   as well; by this we mean that the various "anon_label" "anon_key"
   methods on ColumnElement were called by all four of these methods,
   where there were many cases where it was necessary that one method
   comes up with the same answer as another of the methods.  This
   has all been centralized into _generate_columns_plus_names
   for all the names except the "proxy key", which is generated
   by _column_naming_convention.

3. compiler._label_select_column has been rewritten to both not make
   any naming decisions nor any "proxy key" decisions, only whether
   to label or not to label; the _generate_columns_plus_names method
   gives it the information, where the proxy keys come from
   _column_naming_convention; previously, these proxy keys were matched
   based on restatement of similar (but not really the same) logic in
   two places.   The heuristics of "whether to label or not to label"
   are also reorganized to be much easier to read and understand.

4. a new method compiler._label_returning_column is added for dialects
   to use in their "generate returning columns" methods.   A
   github search reveals a small number of third party dialects also
   doing this using the prior _label_select_column method so we
   try to make sure _label_select_column continues to work the
   exact same way for that specific use case; for the "SELECT" use
   case it now needs

5. After some attempts to do it different ways, for the case where
   _proxy_key is giving us some kind of anon label, we are hard
   changing it to "_no_label" right now, as there's not currently
   a way to fully match anonymized labels from stmt.c or
   stmt.selected_columns to what will be in the result map.  The
   idea of "_no_label" is to encourage the user to use label('name')
   for columns they want to be able to target by string name that
   don't have a natural name.

Change-Id: I7a92a66f3a7e459ccf32587ac0a3c306650daf11
2021-07-12 18:50:29 -04:00

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from sqlalchemy import bindparam
from sqlalchemy import Boolean
from sqlalchemy import cast
from sqlalchemy import exc as exceptions
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import or_
from sqlalchemy import select
from sqlalchemy import String
from sqlalchemy import testing
from sqlalchemy import type_coerce
from sqlalchemy.engine import default
from sqlalchemy.ext.compiler import compiles
from sqlalchemy.sql import coercions
from sqlalchemy.sql import column
from sqlalchemy.sql import LABEL_STYLE_TABLENAME_PLUS_COL
from sqlalchemy.sql import roles
from sqlalchemy.sql import table
from sqlalchemy.sql.elements import _truncated_label
from sqlalchemy.sql.elements import ColumnElement
from sqlalchemy.sql.elements import WrapsColumnExpression
from sqlalchemy.sql.selectable import LABEL_STYLE_NONE
from sqlalchemy.testing import assert_raises
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import AssertsCompiledSQL
from sqlalchemy.testing import engines
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import mock
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table
IDENT_LENGTH = 29
class MaxIdentTest(fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = "DefaultDialect"
__backend__ = True
table1 = table(
"some_large_named_table",
column("this_is_the_primarykey_column"),
column("this_is_the_data_column"),
)
table2 = table(
"table_with_exactly_29_characs",
column("this_is_the_primarykey_column"),
column("this_is_the_data_column"),
)
def _length_fixture(self, length=IDENT_LENGTH, positional=False):
dialect = default.DefaultDialect()
dialect.max_identifier_length = (
dialect._user_defined_max_identifier_length
) = length
if positional:
dialect.paramstyle = "format"
dialect.positional = True
return dialect
def _engine_fixture(self, length=IDENT_LENGTH):
eng = engines.testing_engine()
eng.dialect.max_identifier_length = (
eng.dialect._user_defined_max_identifier_length
) = length
return eng
def test_label_length_raise_too_large(self):
max_ident_length = testing.db.dialect.max_identifier_length
eng = engines.testing_engine(
options={"label_length": max_ident_length + 10}
)
assert_raises_message(
exceptions.ArgumentError,
"Label length of %d is greater than this dialect's maximum "
"identifier length of %d"
% (max_ident_length + 10, max_ident_length),
eng.connect,
)
def test_label_length_custom_maxlen(self):
max_ident_length = testing.db.dialect.max_identifier_length
eng = engines.testing_engine(
options={
"label_length": max_ident_length + 10,
"max_identifier_length": max_ident_length + 20,
}
)
with eng.connect() as conn:
eq_(conn.dialect.max_identifier_length, max_ident_length + 20)
def test_label_length_custom_maxlen_dialect_only(self):
dialect = default.DefaultDialect(max_identifier_length=47)
eq_(dialect.max_identifier_length, 47)
def test_label_length_custom_maxlen_user_set_manually(self):
eng = engines.testing_engine()
eng.dialect.max_identifier_length = 47
# assume the dialect has no on-connect change
with mock.patch.object(
eng.dialect,
"_check_max_identifier_length",
side_effect=lambda conn: None,
):
with eng.connect():
pass
# it was maintained
eq_(eng.dialect.max_identifier_length, 47)
def test_label_length_too_large_custom_maxlen(self):
max_ident_length = testing.db.dialect.max_identifier_length
eng = engines.testing_engine(
options={
"label_length": max_ident_length - 10,
"max_identifier_length": max_ident_length - 20,
}
)
assert_raises_message(
exceptions.ArgumentError,
"Label length of %d is greater than this dialect's maximum "
"identifier length of %d"
% (max_ident_length - 10, max_ident_length - 20),
eng.connect,
)
def test_custom_max_identifier_length(self):
max_ident_length = testing.db.dialect.max_identifier_length
eng = engines.testing_engine(
options={"max_identifier_length": max_ident_length + 20}
)
with eng.connect() as conn:
eq_(conn.dialect.max_identifier_length, max_ident_length + 20)
def test_max_identifier_length_onconnect(self):
eng = engines.testing_engine()
def _check_max_identifer_length(conn):
return 47
with mock.patch.object(
eng.dialect,
"_check_max_identifier_length",
side_effect=_check_max_identifer_length,
) as mock_:
with eng.connect():
eq_(eng.dialect.max_identifier_length, 47)
eq_(mock_.mock_calls, [mock.call(mock.ANY)])
def test_max_identifier_length_onconnect_returns_none(self):
eng = engines.testing_engine()
max_ident_length = eng.dialect.max_identifier_length
def _check_max_identifer_length(conn):
return None
with mock.patch.object(
eng.dialect,
"_check_max_identifier_length",
side_effect=_check_max_identifer_length,
) as mock_:
with eng.connect():
eq_(eng.dialect.max_identifier_length, max_ident_length)
eq_(mock_.mock_calls, [mock.call(mock.ANY)])
def test_custom_max_identifier_length_onconnect(self):
eng = engines.testing_engine(options={"max_identifier_length": 49})
def _check_max_identifer_length(conn):
return 47
with mock.patch.object(
eng.dialect,
"_check_max_identifier_length",
side_effect=_check_max_identifer_length,
) as mock_:
with eng.connect():
eq_(eng.dialect.max_identifier_length, 49)
eq_(mock_.mock_calls, []) # was not called
def test_table_alias_1(self):
self.assert_compile(
self.table2.alias().select(),
"SELECT "
"table_with_exactly_29_c_1."
"this_is_the_primarykey_column, "
"table_with_exactly_29_c_1.this_is_the_data_column "
"FROM "
"table_with_exactly_29_characs "
"AS table_with_exactly_29_c_1",
dialect=self._length_fixture(),
)
def test_table_alias_2(self):
table1 = self.table1
table2 = self.table2
ta = table2.alias()
on = table1.c.this_is_the_data_column == ta.c.this_is_the_data_column
self.assert_compile(
select(table1, ta)
.select_from(table1.join(ta, on))
.where(ta.c.this_is_the_data_column == "data3")
.set_label_style(LABEL_STYLE_NONE),
"SELECT "
"some_large_named_table.this_is_the_primarykey_column, "
"some_large_named_table.this_is_the_data_column, "
"table_with_exactly_29_c_1.this_is_the_primarykey_column, "
"table_with_exactly_29_c_1.this_is_the_data_column "
"FROM "
"some_large_named_table "
"JOIN "
"table_with_exactly_29_characs "
"AS "
"table_with_exactly_29_c_1 "
"ON "
"some_large_named_table.this_is_the_data_column = "
"table_with_exactly_29_c_1.this_is_the_data_column "
"WHERE "
"table_with_exactly_29_c_1.this_is_the_data_column = "
":this_is_the_data_column_1",
dialect=self._length_fixture(),
)
def test_too_long_name_disallowed(self):
m = MetaData()
t = Table(
"this_name_is_too_long_for_what_were_doing_in_this_test",
m,
Column("foo", Integer),
)
eng = self._engine_fixture()
methods = (t.create, t.drop, m.create_all, m.drop_all)
for meth in methods:
assert_raises(exceptions.IdentifierError, meth, eng)
def _assert_labeled_table1_select(self, s):
table1 = self.table1
compiled = s.compile(dialect=self._length_fixture())
assert set(
compiled._create_result_map()["some_large_named_table__2"][1]
).issuperset(
[
"some_large_named_table_this_is_the_data_column",
"some_large_named_table__2",
table1.c.this_is_the_data_column,
]
)
assert set(
compiled._create_result_map()["some_large_named_table__1"][1]
).issuperset(
[
"some_large_named_table_this_is_the_primarykey_column",
"some_large_named_table__1",
table1.c.this_is_the_primarykey_column,
]
)
def test_result_map_use_labels(self):
table1 = self.table1
s = (
table1.select()
.set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
.order_by(table1.c.this_is_the_primarykey_column)
)
self._assert_labeled_table1_select(s)
def test_result_map_limit(self):
table1 = self.table1
# some dialects such as oracle (and possibly ms-sql in a future
# version) generate a subquery for limits/offsets. ensure that the
# generated result map corresponds to the selected table, not the
# select query
s = (
table1.select()
.set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
.order_by(table1.c.this_is_the_primarykey_column)
.limit(2)
)
self._assert_labeled_table1_select(s)
def test_result_map_subquery(self):
table1 = self.table1
s = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias("foo")
)
s2 = select(s)
compiled = s2.compile(dialect=self._length_fixture())
assert set(
compiled._create_result_map()["this_is_the_data_column"][1]
).issuperset(["this_is_the_data_column", s.c.this_is_the_data_column])
assert set(
compiled._create_result_map()["this_is_the_primarykey__1"][1]
).issuperset(
[
"this_is_the_primarykey_column",
"this_is_the_primarykey__1",
s.c.this_is_the_primarykey_column,
]
)
def test_result_map_anon_alias(self):
table1 = self.table1
dialect = self._length_fixture()
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias()
)
s = select(q).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
self.assert_compile(
s,
"SELECT "
"anon_1.this_is_the_primarykey__2 AS anon_1_this_is_the_prim_1, "
"anon_1.this_is_the_data_column AS anon_1_this_is_the_data_3 "
"FROM ("
"SELECT "
"some_large_named_table."
"this_is_the_primarykey_column AS this_is_the_primarykey__2, "
"some_large_named_table."
"this_is_the_data_column AS this_is_the_data_column "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :this_is_the_primarykey__1"
") "
"AS anon_1",
dialect=dialect,
)
compiled = s.compile(dialect=dialect)
assert set(
compiled._create_result_map()["anon_1_this_is_the_data_3"][1]
).issuperset(
[
"anon_1_this_is_the_data_3",
q.corresponding_column(table1.c.this_is_the_data_column),
]
)
assert set(
compiled._create_result_map()["anon_1_this_is_the_prim_1"][1]
).issuperset(
[
"anon_1_this_is_the_prim_1",
q.corresponding_column(table1.c.this_is_the_primarykey_column),
]
)
def test_column_bind_labels_1(self):
table1 = self.table1
s = table1.select().where(table1.c.this_is_the_primarykey_column == 4)
self.assert_compile(
s,
"SELECT some_large_named_table.this_is_the_primarykey_column, "
"some_large_named_table.this_is_the_data_column "
"FROM some_large_named_table WHERE "
"some_large_named_table.this_is_the_primarykey_column = "
":this_is_the_primarykey__1",
checkparams={"this_is_the_primarykey__1": 4},
dialect=self._length_fixture(),
)
self.assert_compile(
s,
"SELECT some_large_named_table.this_is_the_primarykey_column, "
"some_large_named_table.this_is_the_data_column "
"FROM some_large_named_table WHERE "
"some_large_named_table.this_is_the_primarykey_column = "
"%s",
checkpositional=(4,),
checkparams={"this_is_the_primarykey__1": 4},
dialect=self._length_fixture(positional=True),
)
def test_column_bind_labels_2(self):
table1 = self.table1
s = table1.select().where(
or_(
table1.c.this_is_the_primarykey_column == 4,
table1.c.this_is_the_primarykey_column == 2,
)
)
self.assert_compile(
s,
"SELECT some_large_named_table.this_is_the_primarykey_column, "
"some_large_named_table.this_is_the_data_column "
"FROM some_large_named_table WHERE "
"some_large_named_table.this_is_the_primarykey_column = "
":this_is_the_primarykey__1 OR "
"some_large_named_table.this_is_the_primarykey_column = "
":this_is_the_primarykey__2",
checkparams={
"this_is_the_primarykey__1": 4,
"this_is_the_primarykey__2": 2,
},
dialect=self._length_fixture(),
)
self.assert_compile(
s,
"SELECT some_large_named_table.this_is_the_primarykey_column, "
"some_large_named_table.this_is_the_data_column "
"FROM some_large_named_table WHERE "
"some_large_named_table.this_is_the_primarykey_column = "
"%s OR "
"some_large_named_table.this_is_the_primarykey_column = "
"%s",
checkparams={
"this_is_the_primarykey__1": 4,
"this_is_the_primarykey__2": 2,
},
checkpositional=(4, 2),
dialect=self._length_fixture(positional=True),
)
def test_bind_param_non_truncated(self):
table1 = self.table1
stmt = table1.insert().values(
this_is_the_data_column=bindparam(
"this_is_the_long_bindparam_name"
)
)
compiled = stmt.compile(dialect=self._length_fixture(length=10))
eq_(
compiled.construct_params(
params={"this_is_the_long_bindparam_name": 5}
),
{"this_is_the_long_bindparam_name": 5},
)
def test_bind_param_truncated_named(self):
table1 = self.table1
bp = bindparam(_truncated_label("this_is_the_long_bindparam_name"))
stmt = table1.insert().values(this_is_the_data_column=bp)
compiled = stmt.compile(dialect=self._length_fixture(length=10))
eq_(
compiled.construct_params(
params={"this_is_the_long_bindparam_name": 5}
),
{"this_1": 5},
)
def test_bind_param_truncated_positional(self):
table1 = self.table1
bp = bindparam(_truncated_label("this_is_the_long_bindparam_name"))
stmt = table1.insert().values(this_is_the_data_column=bp)
compiled = stmt.compile(
dialect=self._length_fixture(length=10, positional=True)
)
eq_(
compiled.construct_params(
params={"this_is_the_long_bindparam_name": 5}
),
{"this_1": 5},
)
class LabelLengthTest(fixtures.TestBase, AssertsCompiledSQL):
__dialect__ = "DefaultDialect"
table1 = table(
"some_large_named_table",
column("this_is_the_primarykey_column"),
column("this_is_the_data_column"),
)
table2 = table(
"table_with_exactly_29_characs",
column("this_is_the_primarykey_column"),
column("this_is_the_data_column"),
)
def test_adjustable_1(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias("foo")
)
x = select(q)
compile_dialect = default.DefaultDialect(label_length=10)
self.assert_compile(
x,
"SELECT "
"foo.this_1, foo.this_2 "
"FROM ("
"SELECT "
"some_large_named_table.this_is_the_primarykey_column "
"AS this_1, "
"some_large_named_table.this_is_the_data_column "
"AS this_2 "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :this_1"
") "
"AS foo",
dialect=compile_dialect,
)
def test_adjustable_2(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias("foo")
)
x = select(q)
compile_dialect = default.DefaultDialect(label_length=10)
self.assert_compile(
x,
"SELECT "
"foo.this_1, foo.this_2 "
"FROM ("
"SELECT "
"some_large_named_table.this_is_the_primarykey_column "
"AS this_1, "
"some_large_named_table.this_is_the_data_column "
"AS this_2 "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :this_1"
") "
"AS foo",
dialect=compile_dialect,
)
def test_adjustable_3(self):
table1 = self.table1
compile_dialect = default.DefaultDialect(label_length=4)
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias("foo")
)
x = select(q)
self.assert_compile(
x,
"SELECT "
"foo._1, foo._2 "
"FROM ("
"SELECT "
"some_large_named_table.this_is_the_primarykey_column "
"AS _1, "
"some_large_named_table.this_is_the_data_column "
"AS _2 "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :_1"
") "
"AS foo",
dialect=compile_dialect,
)
def test_adjustable_4(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias()
)
x = select(q).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
compile_dialect = default.DefaultDialect(label_length=10)
self.assert_compile(
x,
"SELECT "
"anon_1.this_2 AS anon_1, "
"anon_1.this_4 AS anon_3 "
"FROM ("
"SELECT "
"some_large_named_table.this_is_the_primarykey_column "
"AS this_2, "
"some_large_named_table.this_is_the_data_column "
"AS this_4 "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :this_1"
") "
"AS anon_1",
dialect=compile_dialect,
)
def test_adjustable_5(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias()
)
x = select(q).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
compile_dialect = default.DefaultDialect(label_length=4)
self.assert_compile(
x,
"SELECT "
"_1._2 AS _1, "
"_1._4 AS _3 "
"FROM ("
"SELECT "
"some_large_named_table.this_is_the_primarykey_column "
"AS _2, "
"some_large_named_table.this_is_the_data_column "
"AS _4 "
"FROM "
"some_large_named_table "
"WHERE "
"some_large_named_table.this_is_the_primarykey_column "
"= :_1"
") "
"AS _1",
dialect=compile_dialect,
)
def test_adjustable_result_schema_column_1(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
.alias("foo")
)
dialect = default.DefaultDialect(label_length=10)
compiled = q.compile(dialect=dialect)
assert set(compiled._create_result_map()["some_2"][1]).issuperset(
[
table1.c.this_is_the_data_column,
"some_large_named_table_this_is_the_data_column",
"some_2",
]
)
assert set(compiled._create_result_map()["some_1"][1]).issuperset(
[
table1.c.this_is_the_primarykey_column,
"some_large_named_table_this_is_the_primarykey_column",
"some_1",
]
)
def test_adjustable_result_schema_column_2(self):
table1 = self.table1
q = (
table1.select()
.where(table1.c.this_is_the_primarykey_column == 4)
.alias("foo")
)
x = select(q)
dialect = default.DefaultDialect(label_length=10)
compiled = x.compile(dialect=dialect)
assert set(compiled._create_result_map()["this_2"][1]).issuperset(
[
q.corresponding_column(table1.c.this_is_the_data_column),
"this_is_the_data_column",
"this_2",
]
)
assert set(compiled._create_result_map()["this_1"][1]).issuperset(
[
q.corresponding_column(table1.c.this_is_the_primarykey_column),
"this_is_the_primarykey_column",
"this_1",
]
)
def test_table_plus_column_exceeds_length(self):
"""test that the truncation only occurs when tablename + colname are
concatenated, if they are individually under the label length.
"""
compile_dialect = default.DefaultDialect(label_length=30)
a_table = table("thirty_characters_table_xxxxxx", column("id"))
other_table = table(
"other_thirty_characters_table_",
column("id"),
column("thirty_characters_table_id"),
)
anon = a_table.alias()
j1 = other_table.outerjoin(
anon, anon.c.id == other_table.c.thirty_characters_table_id
)
self.assert_compile(
select(other_table, anon)
.select_from(j1)
.set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL),
"SELECT "
"other_thirty_characters_table_.id "
"AS other_thirty_characters__1, "
"other_thirty_characters_table_.thirty_characters_table_id "
"AS other_thirty_characters__2, "
"thirty_characters_table__1.id "
"AS thirty_characters_table__3 "
"FROM "
"other_thirty_characters_table_ "
"LEFT OUTER JOIN "
"thirty_characters_table_xxxxxx AS thirty_characters_table__1 "
"ON thirty_characters_table__1.id = "
"other_thirty_characters_table_.thirty_characters_table_id",
dialect=compile_dialect,
)
def test_colnames_longer_than_labels_lowercase(self):
t1 = table("a", column("abcde"))
self._test_colnames_longer_than_labels(t1)
def test_colnames_longer_than_labels_uppercase(self):
m = MetaData()
t1 = Table("a", m, Column("abcde", Integer))
self._test_colnames_longer_than_labels(t1)
def _test_colnames_longer_than_labels(self, t1):
dialect = default.DefaultDialect(label_length=4)
a1 = t1.alias(name="asdf")
# 'abcde' is longer than 4, but rendered as itself
# needs to have all characters
s = select(a1)
self.assert_compile(
select(a1), "SELECT asdf.abcde FROM a AS asdf", dialect=dialect
)
compiled = s.compile(dialect=dialect)
assert set(compiled._create_result_map()["abcde"][1]).issuperset(
["abcde", a1.c.abcde, "abcde"]
)
# column still there, but short label
s = select(a1).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
self.assert_compile(
s, "SELECT asdf.abcde AS _1 FROM a AS asdf", dialect=dialect
)
compiled = s.compile(dialect=dialect)
assert set(compiled._create_result_map()["_1"][1]).issuperset(
["asdf_abcde", a1.c.abcde, "_1"]
)
def test_label_overlap_unlabeled(self):
"""test that an anon col can't overlap with a fixed name, #3396"""
table1 = table(
"tablename", column("columnname_one"), column("columnn_1")
)
stmt = select(table1).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL)
dialect = default.DefaultDialect(label_length=23)
self.assert_compile(
stmt,
"SELECT tablename.columnname_one AS tablename_columnn_1, "
"tablename.columnn_1 AS tablename_columnn_2 FROM tablename",
dialect=dialect,
)
compiled = stmt.compile(dialect=dialect)
eq_(
set(compiled._create_result_map()),
set(["tablename_columnn_1", "tablename_columnn_2"]),
)
class ColExprLabelTest(fixtures.TestBase, AssertsCompiledSQL):
"""Test the :class:`.WrapsColumnExpression` mixin, which provides
auto-labels that match a named expression
"""
__dialect__ = "default"
table1 = table("some_table", column("name"), column("value"))
def _fixture(self):
class SomeColThing(WrapsColumnExpression, ColumnElement):
def __init__(self, expression):
self.clause = coercions.expect(
roles.ExpressionElementRole, expression
)
@property
def wrapped_column_expression(self):
return self.clause
@compiles(SomeColThing)
def process(element, compiler, **kw):
return "SOME_COL_THING(%s)" % compiler.process(
element.clause, **kw
)
return SomeColThing
def test_column_auto_label_dupes_label_style_none(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
table1.c.name,
table1.c.name,
expr(table1.c.name),
expr(table1.c.name),
).set_label_style(LABEL_STYLE_NONE),
"SELECT some_table.name, some_table.name, "
"SOME_COL_THING(some_table.name) AS name, "
"SOME_COL_THING(some_table.name) AS name FROM some_table",
)
def test_column_auto_label_dupes_label_style_disambiguate(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
table1.c.name,
table1.c.name,
expr(table1.c.name),
expr(table1.c.name),
),
"SELECT some_table.name, some_table.name AS name__1, "
"SOME_COL_THING(some_table.name) AS name__2, "
"SOME_COL_THING(some_table.name) AS name__3 "
"FROM some_table",
)
def test_anon_expression_fallback(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(table1.c.name + "foo", expr(table1.c.name + "foo")),
"SELECT some_table.name || :name_1 AS anon_1, "
"SOME_COL_THING(some_table.name || :name_2) AS anon_2 "
"FROM some_table",
)
def test_anon_expression_fallback_use_labels(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
table1.c.name + "foo", expr(table1.c.name + "foo")
).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL),
"SELECT some_table.name || :name_1 AS anon_1, "
"SOME_COL_THING(some_table.name || :name_2) AS anon_2 "
"FROM some_table",
)
def test_label_auto_label(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
expr(table1.c.name.label("foo")),
table1.c.name.label("bar"),
table1.c.value,
),
"SELECT SOME_COL_THING(some_table.name) AS foo, "
"some_table.name AS bar, some_table.value FROM some_table",
)
def test_cast_auto_label_label_style_none(self):
table1 = self.table1
self.assert_compile(
select(
cast(table1.c.name, Integer),
cast(table1.c.name, String),
table1.c.name,
).set_label_style(LABEL_STYLE_NONE),
"SELECT CAST(some_table.name AS INTEGER) AS name, "
"CAST(some_table.name AS VARCHAR) AS name, "
"some_table.name FROM some_table",
)
def test_cast_auto_label_label_style_disabmiguate(self):
table1 = self.table1
self.assert_compile(
select(
cast(table1.c.name, Integer),
cast(table1.c.name, String),
table1.c.name,
),
"SELECT CAST(some_table.name AS INTEGER) AS name, "
"CAST(some_table.name AS VARCHAR) AS name__1, "
"some_table.name AS name_1 FROM some_table",
)
def test_type_coerce_auto_label_label_style_none(self):
table1 = self.table1
self.assert_compile(
select(
type_coerce(table1.c.name, Integer),
type_coerce(table1.c.name, String),
table1.c.name,
).set_label_style(LABEL_STYLE_NONE),
# ideally type_coerce wouldn't label at all...
"SELECT some_table.name AS name, "
"some_table.name AS name, "
"some_table.name FROM some_table",
)
def test_type_coerce_auto_label_label_style_disambiguate(self):
table1 = self.table1
self.assert_compile(
select(
type_coerce(table1.c.name, Integer),
type_coerce(table1.c.name, String),
table1.c.name,
),
# ideally type_coerce wouldn't label at all...
"SELECT some_table.name AS name, "
"some_table.name AS name__1, "
"some_table.name AS name_1 FROM some_table",
)
def test_boolean_auto_label(self):
col = column("value", Boolean)
self.assert_compile(
select(~col, col),
# not sure if this SQL is right but this is what it was
# before the new labeling, just different label name
"SELECT value = 0 AS value, value",
)
def test_label_auto_label_use_labels(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
expr(table1.c.name.label("foo")),
table1.c.name.label("bar"),
table1.c.value,
).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL),
# the expr around label is treated the same way as plain column
# with label
"SELECT SOME_COL_THING(some_table.name) AS foo, "
"some_table.name AS bar, "
"some_table.value AS some_table_value FROM some_table",
)
def test_column_auto_label_dupes_use_labels(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(
table1.c.name,
table1.c.name,
expr(table1.c.name),
expr(table1.c.name),
).set_label_style(LABEL_STYLE_TABLENAME_PLUS_COL),
"SELECT some_table.name AS some_table_name, "
"some_table.name AS some_table_name__1, "
"SOME_COL_THING(some_table.name) AS some_table_name_1, "
"SOME_COL_THING(some_table.name) AS some_table_name_2 "
"FROM some_table",
)
def test_column_auto_label_use_labels(self):
expr = self._fixture()
table1 = self.table1
self.assert_compile(
select(table1.c.name, expr(table1.c.value)).set_label_style(
LABEL_STYLE_TABLENAME_PLUS_COL
),
"SELECT some_table.name AS some_table_name, "
"SOME_COL_THING(some_table.value) "
"AS some_table_value FROM some_table",
)
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