Problematic tests list (110 rows):
bugs.core_0203_test  CREATE VIEW ignores PLAN
bugs.core_1549_test  Subquery-based predicates are not evaluated early in the join order
bugs.core_2264_test  ALTER DOMAIN with dependencies may leave a transaction handle in inconsistent state causing segmentation faults
bugs.core_2650_test  Improve sorting performance when long VARCHARs are involved
bugs.core_3076_test  Better performance for (table.field = :param OR :param = -1) in where clause
bugs.core_3450_test  Inefficient optimization (regression)
bugs.core_4165_test  Replace the hierarchical union execution with the plain one
bugs.core_4285_test  Choose the best matching index for navigation
bugs.core_4318_test  Regression: Predicates involving PSQL variables/parameters are not pushed inside the aggregation
bugs.core_4921_test  Predicate IS [NOT] DISTINCT FROM is not pushed into unions/aggregates thus causing sub-optimal plans
bugs.core_5020_test  Regression: ORDER BY clause on compound index may disable usage of other indices
bugs.core_5070_test  Compound index cannot be used for filtering in some ORDER/GROUP BY queries
bugs.core_5236_test  IN/ANY/ALL predicates may cause sub-optimal (late filtering) execution of joins
bugs.core_6278_test  Efficient table scans for DBKEY-based range conditions
bugs.gh_4314_test  Sub-optimal predicate checking while selecting from a view [CORE3981]
bugs.gh_4954_test  subselect losing the index when where clause includes coalesce() [CORE4640]
bugs.gh_6802_test  When the statement timeout is set, it causes the lock manager to delay reporting deadlocks until timeout is expired
bugs.gh_7137_test  Optimizer regression: bad plan (HASH instead of JOIN) is chosen for some inner joins
bugs.gh_7398_test  Worst plan sort created to execute an indexed tables
bugs.gh_8161_test  Cardinality estimation should use primary record versions only
bugs.gh_8488_test  MIN/MAX aggregates may badly affect the join order in queries with mixed INNER/LEFT joins
bugs.gh_8821_test  REGRESSION: natural plan instead of primary/unique index
functional.arno.optimizer.test_opt_aggregate_distribution_01  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_02  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_03  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_04  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_05  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_06  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_07  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_08  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_09  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_10  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_11  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_12  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_13  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_aggregate_distribution_14  Try to deliver HAVING CLAUSE conjunctions to the WHERE clause
functional.arno.optimizer.test_opt_full_join_01  FULL OUTER JOIN, list all values
functional.arno.optimizer.test_opt_full_join_02  FULL OUTER JOIN, list all values, but filtered in WHERE clause
functional.arno.optimizer.test_opt_full_join_03  FULL OUTER JOIN, list all values, but filtered in WHERE clause
functional.arno.optimizer.test_opt_full_join_04  FULL OUTER JOIN, list all values, but filtered in WHERE clause
functional.arno.optimizer.test_opt_inner_join_01  INNER JOIN join order
functional.arno.optimizer.test_opt_inner_join_02  INNER JOIN join order
functional.arno.optimizer.test_opt_inner_join_03  INNER JOIN join order
functional.arno.optimizer.test_opt_inner_join_04  INNER JOIN join order LIKE and IS NULL
functional.arno.optimizer.test_opt_inner_join_05  INNER JOIN join order LIKE and STARTING WITH
functional.arno.optimizer.test_opt_inner_join_06  INNER JOIN join order and VIEW
functional.arno.optimizer.test_opt_inner_join_07  INNER JOIN join order and VIEW
functional.arno.optimizer.test_opt_inner_join_08  INNER JOIN join order and VIEW
functional.arno.optimizer.test_opt_inner_join_09  INNER JOIN join order and distribution
functional.arno.optimizer.test_opt_inner_join_10  INNER JOIN join order
functional.arno.optimizer.test_opt_inner_join_merge_01  INNER JOIN join merge
functional.arno.optimizer.test_opt_inner_join_merge_02  INNER JOIN join merge
functional.arno.optimizer.test_opt_inner_join_merge_03  INNER JOIN join merge
functional.arno.optimizer.test_opt_inner_join_merge_04  INNER JOIN join merge and NULLs
functional.arno.optimizer.test_opt_inner_join_merge_05  INNER JOIN join merge and VIEWs
functional.arno.optimizer.test_opt_inner_join_merge_06  INNER JOIN join merge and SP
functional.arno.optimizer.test_opt_left_join_01  LEFT OUTER JOIN with no match at all
functional.arno.optimizer.test_opt_left_join_02  LEFT OUTER JOIN with no match and IS NULL in WHERE clause
functional.arno.optimizer.test_opt_left_join_03  LEFT OUTER JOIN with full match and reference in WHERE clause
functional.arno.optimizer.test_opt_left_join_04  LEFT OUTER JOIN with full match
functional.arno.optimizer.test_opt_left_join_05  LEFT OUTER JOIN with full match, but limited in ON clause
functional.arno.optimizer.test_opt_left_join_08  LEFT OUTER JOIN with full match, but limited in ON and WHERE clause
functional.arno.optimizer.test_opt_left_join_09  LEFT OUTER JOIN with full match, but limited in ON and WHERE clause
functional.arno.optimizer.test_opt_left_join_10  LEFT OUTER JOIN with IS NULL burried in WHERE clause
functional.arno.optimizer.test_opt_left_join_12  LEFT OUTER JOIN with distribution CASE
functional.arno.optimizer.test_opt_left_join_13  LEFT OUTER JOIN VIEW with full match
functional.arno.optimizer.test_opt_mixed_joins_01  Mixed JOINS
functional.arno.optimizer.test_opt_mixed_joins_02  Mixed JOINS
functional.arno.optimizer.test_opt_mixed_joins_03  Mixed JOINS
functional.arno.optimizer.test_opt_mixed_joins_04  Mixed JOINS
functional.arno.optimizer.test_opt_mixed_joins_05  Mixed JOINS
functional.arno.optimizer.test_opt_mixed_joins_06  Mixed JOINS
functional.arno.optimizer.test_opt_multi_index_selection_01  Unique index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_02  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_03  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_04  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_05  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_06  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_07  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_multi_index_selection_08  Best match index selection (multi segment)
functional.arno.optimizer.test_opt_single_index_selection_01  Unique index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_02  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_03  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_04  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_05  Best match index selection (single segment) ASC and DESC
functional.arno.optimizer.test_opt_single_index_selection_06  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_07  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_08  Best match index selection (single segment)
functional.arno.optimizer.test_opt_single_index_selection_09  Best match index selection (single segment) OR
functional.arno.optimizer.test_opt_single_index_selection_10  Best match index selection (single segment) OR
functional.arno.optimizer.test_opt_single_index_selection_11  Best match index selection (single segment)
functional.arno.optimizer.test_opt_sort_by_index_01  ORDER BY ASC using index (unique)
functional.arno.optimizer.test_opt_sort_by_index_02  ORDER BY DESC using index (unique)
functional.arno.optimizer.test_opt_sort_by_index_03  ORDER BY ASC using index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_04  ORDER BY DESC using index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_05  MAX() and DESC index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_06  MAX() and ASC index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_07  MIN() and ASC index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_08  MIN() and DESC index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_09  ORDER BY ASC using index (non-unique)
functional.arno.optimizer.test_opt_sort_by_index_10  ORDER BY ASC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_11  ORDER BY ASC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_12  ORDER BY ASC, DESC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_13  ORDER BY ASC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_14  ORDER BY ASC NULLS FIRST using index
functional.arno.optimizer.test_opt_sort_by_index_15  ORDER BY ASC NULLS LAST using index
functional.arno.optimizer.test_opt_sort_by_index_16  ORDER BY DESC NULLS FIRST using index
functional.arno.optimizer.test_opt_sort_by_index_17  ORDER BY DESC NULLS LAST using index
functional.arno.optimizer.test_opt_sort_by_index_18  ORDER BY ASC using index (single) and WHERE clause
functional.arno.optimizer.test_opt_sort_by_index_19  ORDER BY ASC using index (multi) and WHERE clause

This list is the same for:
4.0.8.3320 2026.09.09 79e94467  CS
4.0.8.3320 2026.09.09 79e94467  SS