Support knowledge metadata filter (#15982)

api/core/rag/entities/metadata_entities.py

@@ -0,0 +1,45 @@
+from collections.abc import Sequence
+from typing import Literal, Optional
+
+from pydantic import BaseModel, Field
+
+SupportedComparisonOperator = Literal[
+    # for string or array
+    "contains",
+    "not contains",
+    "start with",
+    "end with",
+    "is",
+    "is not",
+    "empty",
+    "not empty",
+    # for number
+    "=",
+    "≠",
+    ">",
+    "<",
+    "≥",
+    "≤",
+    # for time
+    "before",
+    "after",
+]
+
+
+class Condition(BaseModel):
+    """
+    Conditon detail
+    """
+
+    name: str
+    comparison_operator: SupportedComparisonOperator
+    value: str | Sequence[str] | None | int | float = None
+
+
+class MetadataCondition(BaseModel):
+    """
+    Metadata Condition.
+    """
+
+    logical_operator: Optional[Literal["and", "or"]] = "and"
+    conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)