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from typing import Dict, Tuple, Union
from langchain.chains.query_constructor.ir import (
Comparator,
Comparison,
Operation,
Operator,
StructuredQuery,
Visitor,
)
class OpenSearchTranslator(Visitor):
"""Translate `OpenSearch` internal query domain-specific
language elements to valid filters."""
allowed_comparators = [
Comparator.EQ,
Comparator.LT,
Comparator.LTE,
Comparator.GT,
Comparator.GTE,
Comparator.CONTAIN,
Comparator.LIKE,
]
"""Subset of allowed logical comparators."""
allowed_operators = [Operator.AND, Operator.OR, Operator.NOT]
"""Subset of allowed logical operators."""
def _format_func(self, func: Union[Operator, Comparator]) -> str:
self._validate_func(func)
comp_operator_map = {
Comparator.EQ: "term",
Comparator.LT: "lt",
Comparator.LTE: "lte",
Comparator.GT: "gt",
Comparator.GTE: "gte",
Comparator.CONTAIN: "match",
Comparator.LIKE: "fuzzy",
Operator.AND: "must",
Operator.OR: "should",
Operator.NOT: "must_not",
}
return comp_operator_map[func]
def visit_operation(self, operation: Operation) -> Dict:
args = [arg.accept(self) for arg in operation.arguments]
return {"bool": {self._format_func(operation.operator): args}}
def visit_comparison(self, comparison: Comparison) -> Dict:
field = f"metadata.{comparison.attribute}"
if comparison.comparator in [
Comparator.LT,
Comparator.LTE,
Comparator.GT,
Comparator.GTE,
]:
return {
"range": {
field: {self._format_func(comparison.comparator): comparison.value}
}
}
if comparison.comparator == Comparator.LIKE:
return {
self._format_func(comparison.comparator): {
field: {"value": comparison.value}
}
}
field = f"{field}.keyword" if isinstance(comparison.value, str) else field
return {self._format_func(comparison.comparator): {field: comparison.value}}
def visit_structured_query(
self, structured_query: StructuredQuery
) -> Tuple[str, dict]:
if structured_query.filter is None:
kwargs = {}
else:
kwargs = {"filter": structured_query.filter.accept(self)}
return structured_query.query, kwargs
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