mirror of
https://github.com/hwchase17/langchain
synced 2024-11-08 07:10:35 +00:00
f92006de3c
0.2rc migrations - [x] Move memory - [x] Move remaining retrievers - [x] graph_qa chains - [x] some dependency from evaluation code potentially on math utils - [x] Move openapi chain from `langchain.chains.api.openapi` to `langchain_community.chains.openapi` - [x] Migrate `langchain.chains.ernie_functions` to `langchain_community.chains.ernie_functions` - [x] migrate `langchain/chains/llm_requests.py` to `langchain_community.chains.llm_requests` - [x] Moving `langchain_community.cross_enoders.base:BaseCrossEncoder` -> `langchain_community.retrievers.document_compressors.cross_encoder:BaseCrossEncoder` (namespace not ideal, but it needs to be moved to `langchain` to avoid circular deps) - [x] unit tests langchain -- add pytest.mark.community to some unit tests that will stay in langchain - [x] unit tests community -- move unit tests that depend on community to community - [x] mv integration tests that depend on community to community - [x] mypy checks Other todo - [x] Make deprecation warnings not noisy (need to use warn deprecated and check that things are implemented properly) - [x] Update deprecation messages with timeline for code removal (likely we actually won't be removing things until 0.4 release) -- will give people more time to transition their code. - [ ] Add information to deprecation warning to show users how to migrate their code base using langchain-cli - [ ] Remove any unnecessary requirements in langchain (e.g., is SQLALchemy required?) --------- Co-authored-by: Erick Friis <erick@langchain.dev>
98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
from typing import Any, Dict, Tuple
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from langchain_core.structured_query import (
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Comparator,
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Comparison,
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Operation,
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Operator,
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StructuredQuery,
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Visitor,
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)
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class SupabaseVectorTranslator(Visitor):
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"""Translate Langchain filters to Supabase PostgREST filters."""
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allowed_operators = [Operator.AND, Operator.OR]
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"""Subset of allowed logical operators."""
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allowed_comparators = [
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Comparator.EQ,
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Comparator.NE,
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Comparator.GT,
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Comparator.GTE,
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Comparator.LT,
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Comparator.LTE,
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Comparator.LIKE,
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]
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"""Subset of allowed logical comparators."""
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metadata_column = "metadata"
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def _map_comparator(self, comparator: Comparator) -> str:
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"""
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Maps Langchain comparator to PostgREST comparator:
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https://postgrest.org/en/stable/references/api/tables_views.html#operators
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"""
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postgrest_comparator = {
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Comparator.EQ: "eq",
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Comparator.NE: "neq",
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Comparator.GT: "gt",
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Comparator.GTE: "gte",
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Comparator.LT: "lt",
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Comparator.LTE: "lte",
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Comparator.LIKE: "like",
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}.get(comparator)
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if postgrest_comparator is None:
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raise Exception(
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f"Comparator '{comparator}' is not currently "
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"supported in Supabase Vector"
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)
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return postgrest_comparator
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def _get_json_operator(self, value: Any) -> str:
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if isinstance(value, str):
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return "->>"
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else:
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return "->"
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def visit_operation(self, operation: Operation) -> str:
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args = [arg.accept(self) for arg in operation.arguments]
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return f"{operation.operator.value}({','.join(args)})"
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def visit_comparison(self, comparison: Comparison) -> str:
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if isinstance(comparison.value, list):
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return self.visit_operation(
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Operation(
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operator=Operator.AND,
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arguments=[
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Comparison(
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comparator=comparison.comparator,
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attribute=comparison.attribute,
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value=value,
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)
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for value in comparison.value
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],
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)
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)
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return ".".join(
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[
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f"{self.metadata_column}{self._get_json_operator(comparison.value)}{comparison.attribute}",
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f"{self._map_comparator(comparison.comparator)}",
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f"{comparison.value}",
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]
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)
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def visit_structured_query(
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self, structured_query: StructuredQuery
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) -> Tuple[str, Dict[str, str]]:
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if structured_query.filter is None:
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kwargs = {}
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else:
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kwargs = {"postgrest_filter": structured_query.filter.accept(self)}
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return structured_query.query, kwargs
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