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from sqlalchemy import Table
_DICTIONARY_KWARGS = ("source", "layout", "lifetime", "primary_key")
def _pop_dictionary_kwargs(kwargs):
"""Pop Dictionary-specific kwargs before Table validates them."""
return {k: kwargs.pop(k, None) for k in _DICTIONARY_KWARGS}
def _apply_dictionary_metadata(table, popped):
"""Set dialect-prefixed kwargs on the table after construction."""
table.kwargs["clickhouse_table_type"] = "dictionary"
if popped.get("source") is not None:
table.source = popped["source"]
table.kwargs["clickhouse_dictionary_source"] = popped["source"]
if popped.get("layout") is not None:
table.layout = popped["layout"]
table.kwargs["clickhouse_dictionary_layout"] = popped["layout"]
if popped.get("lifetime") is not None:
table.lifetime = popped["lifetime"]
table.kwargs["clickhouse_dictionary_lifetime"] = popped["lifetime"]
if popped.get("primary_key") is not None:
table.primary_key_def = popped["primary_key"]
table.kwargs["clickhouse_dictionary_primary_key"] = popped["primary_key"]
class Dictionary(Table):
"""
Represents a ClickHouse Dictionary.
Inherits from Table so it can be attached to metadata and have columns.
Custom kwargs must be intercepted before Table's dialect-kwarg validation
runs. The interception point differs between SQLAlchemy versions:
- SQA 1.4: Table.__new__ calls _init() directly, bypassing __init__
- SQA 2.x: Table.__new__ calls __init__() directly (no _init)
We override both to handle either path.
"""
__visit_name__ = "dictionary"
def __init__(self, name, metadata, *args, **kwargs):
popped = _pop_dictionary_kwargs(kwargs)
super().__init__(name, metadata, *args, **kwargs)
_apply_dictionary_metadata(self, popped)
def _init(self, name, metadata, *args, **kwargs):
popped = _pop_dictionary_kwargs(kwargs)
super()._init(name, metadata, *args, **kwargs)
_apply_dictionary_metadata(self, popped)
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