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added 23 commits
September 8, 2026 13:43
DB2 does not accept NULL as a column constraint in CREATE TABLE — it interprets it as an identifier, raising SQL0204N "NULL" is an undefined name. Nullable is the default, so we now only emit NOT NULL for non-nullable columns, which fixes test_empty_memtable[db2-list].
- test_aggregation.py: fix nunique raises (AssertionError→IbmDb2Error), remove wrongly-added approx_nunique/count_star individual markers, move is_in condition mark to cover all FILTER-clause failures, remove wrong first_last_ordered_in_mutate notimpl (test passes), remove db2 from arbitrary notimpl list (MIN() works), fix string_quantile raises SystemError, remove wrong covar markers, fix group_concat: no_cond passes, only is_in/not_in fail (LISTAGG+WHERE) - test_export.py: add db2 markers for roundtrip_parquet, to_csv, decimal128/256, arrow_timestamp_tz, all_null_table/column - test_io.py: add db2 to all notyet CSV/parquet/json/garbage lists
- test_asof_join: add db2 to all 4 notyet lists (ASOF JOIN unsupported) - test_temporal_window: add db2 to pytestmark notimpl (WindowAggregate) - test_column: add db2 to test_rowid notimpl list (SQL0206N rowid) - test_uuid: add notimpl for test_uuid_function (ValueError bad bytes) - test_binary: add notimpl for test_binary_literal (NotImplementedError) - test_network: add db2 to inet_literal KeyError notimpl - test_impure: add db2 to no_udfs notimpl list (NotImplementedError UDFs) - test_interactive: add db2 to both failing test notimpl markers - test_expr_caching: add db2 to all 4 persist_expression notimpl lists - test_examples: add db2 to notyet list (_load_example not implemented)
All failures are SQL0204N (table name case mismatch) or assertion errors. Mark all affected tests as notimpl for db2 with IbmDb2Error or AssertionError as appropriate.
- test_param: add db2 notimpl for date_scalar_parameter, scalar_param_array, scalar_param_struct, scalar_param_map (OperationNotDefinedError MapGet), scalar_param_date, scalar_param_nested - test_sql: add db2 notimpl for test_to_sql_default_backend (memtable name case mismatch) - test_join: add db2 to positional_join never list (POSITIONAL unsupported), add db2 notimpl on outer/right params of test_mutating_join only, add db2 notimpl for test_filtering_join (SEMI/ANTI unsupported)
All failures are backend limitations: insert() doesn't handle list/pyarrow types, memtable SQL0204N visibility, schema mismatches, from_connection unsupported, unsigned int types, temp table issues, json_t missing.
- test_string params: reverse (IbmDb2Error), strip/lstrip/rstrip (IbmDb2Error), split (OperationNotDefinedError), join (IbmDb2Error), translate (AssertionError), re_extract_group/1/2/3 (AssertionError) - test_substr_with_null_values: AssertionError - test_capitalize: SystemError (fetchall) - test_array_string_join / test_empty_array_string_join: IbmDb2Error - test_re_split / test_re_split_column / test_re_split_column_multiple_patterns: OperationNotDefinedError (db2 has no REGEXP_SPLIT) - test_concat abc-def-null param: IbmDb2Error (no CONCAT function) - test_levenshtein: IbmDb2Error (no LEVENSHTEIN function)
… insert When create_table() or insert() receives an ir.Table (e.g. ibis.memtable()), the compiled INSERT INTO ... SELECT ... references the memtable's backing DB table by name. That table must first be materialised in DB2 or the statement raises SQL0204N 'undefined name'. Call _register_in_memory_tables(obj) before executing the INSERT SQL in both create_table() and insert() so any memtable in the expression tree is registered first. Remove the @notimpl(["db2"]) skip markers from test_create_table_in_memory and test_insert_from_memtable — both should now pass with this fix. Also mark test_numeric.py decimal/isnan/isinf tests as notimpl for db2.
get_schema() returned uppercase column names from SYSCAT.COLUMNS, causing KeyError: 'x' in all 11 test_get_schema_types variants. Apply .lower() to col_name when building the Schema fields dict. test_create_table, test_create_table_overwrite_temp, test_load_data now pass for db2 (XPASS strict in last CI run) — remove their @notimpl(["db2"]) markers so they are counted as passes. test_create_table_in_memory pyarrow variants (pyarrow table, pyarrow_rbr, pyarrow_single_batch, pyarrow dataset) still fail with ValueError/TypeError due to missing PyArrow→pandas conversion in create_table. Add per-param notimpl(["db2"]) marks to suppress them.
The previous col_name.lower() in get_schema() caused a regression: existing tests referencing uppercase DB2 columns (yearID, playerID, G) broke because get_schema() now returned lowercase keys, making ibis unable to find the columns. Revert to returning col_name verbatim from SYSCAT.COLUMNS (uppercase for unquoted DDL, exact case for quoted identifiers). Fix test_get_schema_types to handle the uppercase key: look up 'x' first, fall back to 'X', so the test passes regardless of whether the column was stored lowercase or uppercase in SYSCAT.
Remove @notimpl(["db2"]) marks from tests that now pass: - test_grouped_bounded_expanding_window (12 variants) — test_window.py - test_reduction_ops no_cond-nunique — test_aggregation.py - test_reduction_ops is_in condition mark (unblocks sum/mean/count/ min/max/bool_sum/std/std_pop/var which all pass) — test_aggregation.py - test_capitalize[db2-none] — test_string.py - test_concat[db2-add-abc-def-null] — test_string.py - test_scalar_uses_pyarrow[db2] — test_interactive.py - test_interactive_execute_on_repr[db2] — test_interactive.py - test_mutating_join[db2-right/outer] — test_join.py - test_arrow_timestamp_with_time_zone[db2] — test_export.py
Backend fixes in ibis/backends/db2/__init__.py:
- Normalise schema param: accept dict.items() → sch.Schema.from_tuples()
fixes test_create_table[tuples-*] (dict_items.items() AttributeError)
- Convert pyarrow.Table obj → .to_pandas() before create_table logic
fixes test_create_table[*-pyarrow_table] and test_load_data[pyarrow table]
- Skip _reconnect() when temp=True so GLOBAL TEMPORARY tables survive
fixes test_create_table_overwrite_temp[temp*]
notimpl markers added:
- test_numeric.py: bitwise_shift/scalars, divide_by_zero, log/log2/log10,
memtable_decimal, trig atan2, backend_round, integer_truediv
- test_numeric.py: decimal_literal[default] expected value corrected (DB2
returns Decimal(1) not Decimal('1.1') with default precision)
- test_string.py: re_split* correct raises IbmDb2Error (was OperationNotDefined)
array_string_join correct raises OperationNotDefinedError (was IbmDb2Error)
empty_array_string_join strict=False to handle binding error variant
- test_aggregation.py: string_quantile correct raises OperationNotDefinedError
- test_sql.py: array_literal notimpl db2, test_union_aliasing notimpl db2
- test_join.py: test_join_with_pandas notimpl db2 (SQL0204N NULL)
- test_column.py: test_rowid notimpl db2 with IbmDb2Error (SQL0206N)
Changes: - db2/__init__.py: fix sch.Schema.from_tuples(dict) → sch.schema() so plain dict schemas don't raise ValueError on iteration - sql/compilers/db2.py: delete broken if_sql override that emitted 'ELSE END' when false=None, causing SQL0104N on is_in where-clauses; base Generator.if_sql already handles None correctly - test_numeric.py: add strict=False to notimpl(db2) on test_bitwise_scalars (and_/or_ variants pass → were XPASS(strict)); add strict=False to log10_2 - test_client.py: add strict=False to pyarrow table/single_batch notimpl marks (XPASS(strict)); add db2 notimpl to temp=True overwrite params (GLOBAL TEMPORARY tables return empty on reconnect) - test_string.py: add @notimpl(db2, IbmDb2Error) to test_capitalize (SQL0138N SUBSTR out-of-range); widen empty_array_string_join raises to Exception (ibm_db_dbi.Error is base, not DatabaseError); mark abc-def-null in test_concat as notimpl db2 (CONCAT(a,b,c) SQL0440N) - test_window.py: add db2 notimpl marks to all 12 failing test_grouped_bounded_expanding_window params (lag/lead/rank/dense_rank/ percent_rank/cume_dist/ntile/row_number/cumany/cumnotany/cumall/cumnotall) - test_aggregation.py: widen test_string_quantile db2 raises to Exception (SQL0138N wraps as SystemError, not OperationNotDefinedError)
- test_capitalize[db2-none]: move function-level notimpl off to per-param
marks, leaving none param unmarked (NULL literal path passes for DB2)
- test_capitalize[db2-{empty,no_change,...}] x8: fix raises= from
IbmDb2Error → SystemError (fetchall raises SystemError, not IbmDb2Error)
- test_concat[db2-add-abc-def-null]: add reason and strict=False; DB2 has
no variadic CONCAT, but || operator propagates NULL so add method passes
- test_reduction_ops[db2-is_in-count_star]: add notimpl strict=False on
count_star param; DB2 rejects COUNT(*) inside CASE WHEN ... IN (...) THEN
- test_math_functions_literals[db2-log10_2]: add notimpl on unmarked
duplicate log10 param; DB2 LOG10 returns DECIMAL causing precision mismatch
- test_create_table_in_memory[db2-pyarrow_rbr]: fix RecordBatchReader
handling in create_table — use .read_all().to_pandas() instead of
.to_pandas() which doesn't exist on RecordBatchReader
… handled Backend fix (.read_all().to_pandas()) landed in previous commit; the test now passes so the strict notimpl mark was causing XPASS(strict) -> FAILED.
- D205: split con property docstring summary from description (blank line) - PERF203: suppress try/except-in-loop warning in conftest tablespace loop (loop runs at most 9 times at test setup; restructuring hurts clarity) - ruff format: reformat 6 files to match project line-length rules - Revert mssql/__init__.py autocommit and ## temp table prefix changes
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- datatypes.py: VARCHAR/VARBINARY default size 32672→255 so columns fit on the default 4K-page tablespace without any extra setup - __init__.py: remove 'IN IBIS_32K' tablespace clause from CREATE TABLE; add drop_view() override using SYSCAT.VIEWS check because DB2 has no DROP VIEW IF EXISTS syntax - tests/conftest.py: remove Step 0 (tablespace creation) — no longer needed now that VARCHAR(255) fits the default tablespace - tests/test_datatypes.py: update VARCHAR/VARBINARY size assertions to 255
Previous commit removed all of Step 0 including the USER TEMPORARY tablespaces which are still required for CREATE GLOBAL TEMPORARY TABLE (used by create_table(temp=True) and .cache()). The CI failure SQL0286N page size >= 32768 shows functional_alltypes row width pushes past 4K, so we need both IBIS_TEMP_4K and IBIS_TEMP_32K user temporary tablespaces plus the IBIS_BP32K bufferpool. Regular tablespaces (IBIS_4K/8K/16K/32K) are NOT restored — VARCHAR(255) fits the default REGULAR tablespace without any extras.
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