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  • `detect_fts()` identifies the wrong table if tables have names that are subsets of each other · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
1155801812 https://github.com/simonw/sqlite-utils/issues/434#issuecomment-1155801812 https://api.github.com/repos/simonw/sqlite-utils/issues/434 IC_kwDOCGYnMM5E5CLU simonw 9599 2022-06-14T23:23:32Z 2022-06-14T23:23:32Z OWNER

Since table names can be quoted like this: sql CREATE VIRTUAL TABLE "searchable_fts" USING FTS4 (text1, text2, [name with . and spaces], content="searchable") OR like this: sql CREATE VIRTUAL TABLE "searchable_fts" USING FTS4 (text1, text2, [name with . and spaces], content=[searchable]) This fix looks to be correct to me (copying from the updated test_with_trace() test):

python ( "SELECT name FROM sqlite_master\n" " WHERE rootpage = 0\n" " AND (\n" " sql LIKE :like\n" " OR sql LIKE :like2\n" " OR (\n" " tbl_name = :table\n" " AND sql LIKE '%VIRTUAL TABLE%USING FTS%'\n" " )\n" " )", { "like": "%VIRTUAL TABLE%USING FTS%content=[dogs]%", "like2": '%VIRTUAL TABLE%USING FTS%content="dogs"%', "table": "dogs", }, )

 
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 `detect_fts()` identifies the wrong table if tables have names that are subsets of each other 1243151184  
1155794149 https://github.com/simonw/sqlite-utils/issues/434#issuecomment-1155794149 https://api.github.com/repos/simonw/sqlite-utils/issues/434 IC_kwDOCGYnMM5E5ATl simonw 9599 2022-06-14T23:09:54Z 2022-06-14T23:09:54Z OWNER

A test that demonstrates the problem: ```python @pytest.mark.parametrize("reverse_order", (True, False)) def test_detect_fts_similar_tables(fresh_db, reverse_order): # https://github.com/simonw/sqlite-utils/issues/434 table1, table2 = ("demo", "demo2") if reverse_order: table1, table2 = table2, table1

fresh_db[table1].insert({"title": "Hello"}).enable_fts(
    ["title"], fts_version="FTS4"
)
fresh_db[table2].insert({"title": "Hello"}).enable_fts(
    ["title"], fts_version="FTS4"
)
assert fresh_db[table1].detect_fts() == "{}_fts".format(table1)
assert fresh_db[table2].detect_fts() == "{}_fts".format(table2)

The order matters - so this test currently passes in one direction and fails in the other:

  assert fresh_db[table2].detect_fts() == "{}_fts".format(table2)

E AssertionError: assert 'demo2_fts' == 'demo_fts' E - demo_fts E + demo2_fts E ? +

tests/test_introspect.py:53: AssertionError ========================================================================================= short test summary info ========================================================================================= FAILED tests/test_introspect.py::test_detect_fts_similar_tables[True] - AssertionError: assert 'demo2_fts' == 'demo_fts' =============================================================================== 1 failed, 1 passed, 855 deselected in 1.00s =============================================================================== ```

 
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 `detect_fts()` identifies the wrong table if tables have names that are subsets of each other 1243151184  
1155791109 https://github.com/simonw/sqlite-utils/issues/434#issuecomment-1155791109 https://api.github.com/repos/simonw/sqlite-utils/issues/434 IC_kwDOCGYnMM5E4_kF simonw 9599 2022-06-14T23:04:40Z 2022-06-14T23:04:40Z OWNER

Definitely a bug - thanks for the detailed write-up!

You're right, the code at fault is here:

https://github.com/simonw/sqlite-utils/blob/1b09538bc6c1fda773590f3e600993ef06591041/sqlite_utils/db.py#L2213-L2231

 
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 `detect_fts()` identifies the wrong table if tables have names that are subsets of each other 1243151184  

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