diff options
Diffstat (limited to 'lib/sqlalchemy/sql/default_comparator.py')
| -rw-r--r-- | lib/sqlalchemy/sql/default_comparator.py | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql/default_comparator.py b/lib/sqlalchemy/sql/default_comparator.py index e77ad765c..09f639163 100644 --- a/lib/sqlalchemy/sql/default_comparator.py +++ b/lib/sqlalchemy/sql/default_comparator.py @@ -14,7 +14,8 @@ from . import operators from .elements import BindParameter, True_, False_, BinaryExpression, \ Null, _const_expr, _clause_element_as_expr, \ ClauseList, ColumnElement, TextClause, UnaryExpression, \ - collate, _is_literal, _literal_as_text, ClauseElement, and_, or_ + collate, _is_literal, _literal_as_text, ClauseElement, and_, or_, \ + Slice from .selectable import SelectBase, Alias, Selectable, ScalarSelect @@ -161,6 +162,29 @@ def _in_impl(expr, op, seq_or_selectable, negate_op, **kw): negate=negate_op) +def _getitem_impl(expr, op, other, **kw): + if isinstance(expr.type, type_api.INDEXABLE): + if isinstance(other, slice): + if expr.type.zero_indexes: + other = slice( + other.start + 1, + other.stop + 1, + other.step + ) + other = Slice( + _check_literal(expr, op, other.start), + _check_literal(expr, op, other.stop), + _check_literal(expr, op, other.step), + ) + else: + if expr.type.zero_indexes: + other += 1 + + return _binary_operate(expr, op, other, **kw) + else: + _unsupported_impl(expr, op, other, **kw) + + def _unsupported_impl(expr, op, *arg, **kw): raise NotImplementedError("Operator '%s' is not supported on " "this expression" % op.__name__) @@ -260,7 +284,7 @@ operator_lookup = { "between_op": (_between_impl, ), "notbetween_op": (_between_impl, ), "neg": (_neg_impl,), - "getitem": (_unsupported_impl,), + "getitem": (_getitem_impl,), "lshift": (_unsupported_impl,), "rshift": (_unsupported_impl,), } |