PowerBI fix for table names with spaces (#4170)

small fix to make sure a table name with spaces is passed correctly to
the API for the schema lookup.

langchain/utilities/powerbi.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import logging
 import os
+from copy import deepcopy
 from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Union
 
 import aiohttp
@@ -12,8 +13,6 @@ from aiohttp import ServerTimeoutError
 from pydantic import BaseModel, Field, root_validator
 from requests.exceptions import Timeout
 
-from langchain.tools.powerbi.prompt import SCHEMA_ERROR_RESPONSE, UNAUTHORIZED_RESPONSE
-
 _LOGGER = logging.getLogger(__name__)
 
 BASE_URL = os.getenv("POWERBI_BASE_URL", "https://api.powerbi.com/v1.0/myorg")
@@ -63,27 +62,29 @@ class PowerBIDataset(BaseModel):
     @property
     def headers(self) -> Dict[str, str]:
         """Get the token."""
-        from azure.core.exceptions import ClientAuthenticationError
-
-        token = None
         if self.token:
-            token = self.token
+            return {
+                "Content-Type": "application/json",
+                "Authorization": "Bearer " + self.token,
+            }
+        from azure.core.exceptions import (  # pylint: disable=import-outside-toplevel
+            ClientAuthenticationError,
+        )
+
         if self.credential:
             try:
                 token = self.credential.get_token(
                     "https://analysis.windows.net/powerbi/api/.default"
                 ).token
+                return {
+                    "Content-Type": "application/json",
+                    "Authorization": "Bearer " + token,
+                }
             except Exception as exc:  # pylint: disable=broad-exception-caught
                 raise ClientAuthenticationError(
                     "Could not get a token from the supplied credentials."
                 ) from exc
-        if not token:
-            raise ClientAuthenticationError("No credential or token supplied.")
-
-        return {
-            "Content-Type": "application/json",
-            "Authorization": "Bearer " + token,
-        }
+        raise ClientAuthenticationError("No credential or token supplied.")
 
     def get_table_names(self) -> Iterable[str]:
         """Get names of tables available."""
@@ -116,10 +117,12 @@ class PowerBIDataset(BaseModel):
         return self.table_names
 
     def _get_tables_todo(self, tables_todo: List[str]) -> List[str]:
-        for table in tables_todo:
+        """Get the tables that still need to be queried."""
+        todo = deepcopy(tables_todo)
+        for table in todo:
             if table in self.schemas:
-                tables_todo.remove(table)
-        return tables_todo
+                todo.remove(table)
+        return todo
 
     def _get_schema_for_tables(self, table_names: List[str]) -> str:
         """Create a string of the table schemas for the supplied tables."""
@@ -135,19 +138,20 @@ class PowerBIDataset(BaseModel):
         tables_requested = self._get_tables_to_query(table_names)
         tables_todo = self._get_tables_todo(tables_requested)
         for table in tables_todo:
+            if " " in table and not table.startswith("'") and not table.endswith("'"):
+                table = f"'{table}'"
             try:
                 result = self.run(
                     f"EVALUATE TOPN({self.sample_rows_in_table_info}, {table})"
                 )
             except Timeout:
                 _LOGGER.warning("Timeout while getting table info for %s", table)
+                self.schemas[table] = "unknown"
                 continue
             except Exception as exc:  # pylint: disable=broad-exception-caught
-                if "bad request" in str(exc).lower():
-                    return SCHEMA_ERROR_RESPONSE
-                if "unauthorized" in str(exc).lower():
-                    return UNAUTHORIZED_RESPONSE
-                return str(exc)
+                _LOGGER.warning("Error while getting table info for %s: %s", table, exc)
+                self.schemas[table] = "unknown"
+                continue
             self.schemas[table] = json_to_md(result["results"][0]["tables"][0]["rows"])
         return self._get_schema_for_tables(tables_requested)
 
@@ -158,19 +162,20 @@ class PowerBIDataset(BaseModel):
         tables_requested = self._get_tables_to_query(table_names)
         tables_todo = self._get_tables_todo(tables_requested)
         for table in tables_todo:
+            if " " in table and not table.startswith("'") and not table.endswith("'"):
+                table = f"'{table}'"
             try:
                 result = await self.arun(
                     f"EVALUATE TOPN({self.sample_rows_in_table_info}, {table})"
                 )
             except ServerTimeoutError:
                 _LOGGER.warning("Timeout while getting table info for %s", table)
+                self.schemas[table] = "unknown"
                 continue
             except Exception as exc:  # pylint: disable=broad-exception-caught
-                if "bad request" in str(exc).lower():
-                    return SCHEMA_ERROR_RESPONSE
-                if "unauthorized" in str(exc).lower():
-                    return UNAUTHORIZED_RESPONSE
-                return str(exc)
+                _LOGGER.warning("Error while getting table info for %s: %s", table, exc)
+                self.schemas[table] = "unknown"
+                continue
             self.schemas[table] = json_to_md(result["results"][0]["tables"][0]["rows"])
         return self._get_schema_for_tables(tables_requested)