remove string literals around type defs

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/sea/queue.py

@@ -1,9 +1,7 @@
 from __future__ import annotations
 
 from abc import ABC
-from typing import List, Optional, Tuple, Union
-
-from databricks.sql.cloudfetch.download_manager import ResultFileDownloadManager
+from typing import List, Optional, Tuple, Union, TYPE_CHECKING
 
 try:
     import pyarrow
@@ -12,12 +10,13 @@
 
 import dateutil
 
-from databricks.sql.backend.sea.backend import SeaDatabricksClient
-from databricks.sql.backend.sea.models.base import (
-    ExternalLink,
-    ResultData,
-    ResultManifest,
-)
+if TYPE_CHECKING:
+    from databricks.sql.backend.sea.backend import SeaDatabricksClient
+    from databricks.sql.backend.sea.models.base import (
+        ExternalLink,
+        ResultData,
+        ResultManifest,
+    )
 from databricks.sql.backend.sea.utils.constants import ResultFormat
 from databricks.sql.exc import ProgrammingError, ServerOperationError
 from databricks.sql.thrift_api.TCLIService.ttypes import TSparkArrowResultLink
@@ -109,7 +108,7 @@ def __init__(
         result_data: ResultData,
         max_download_threads: int,
         ssl_options: SSLOptions,
-        sea_client: "SeaDatabricksClient",
+        sea_client: SeaDatabricksClient,
         statement_id: str,
         total_chunk_count: int,
         lz4_compressed: bool = False,
@@ -159,7 +158,7 @@ def __init__(
         # Initialize table and position
         self.table = self._create_table_from_link(first_link)
 
-    def _convert_to_thrift_link(self, link: "ExternalLink") -> TSparkArrowResultLink:
+    def _convert_to_thrift_link(self, link: ExternalLink) -> TSparkArrowResultLink:
         """Convert SEA external links to Thrift format for compatibility with existing download manager."""
         # Parse the ISO format expiration time
         expiry_time = int(dateutil.parser.parse(link.expiration).timestamp())
@@ -172,7 +171,7 @@ def _convert_to_thrift_link(self, link: "ExternalLink") -> TSparkArrowResultLink
             httpHeaders=link.http_headers or {},
         )
 
-    def _get_chunk_link(self, chunk_index: int) -> "ExternalLink":
+    def _get_chunk_link(self, chunk_index: int) -> ExternalLink:
         """Progress to the next chunk link."""
         if chunk_index >= self._total_chunk_count:
             raise ValueError(
@@ -191,7 +190,7 @@ def _get_chunk_link(self, chunk_index: int) -> "ExternalLink":
             )
 
     def _create_table_from_link(
-        self, link: "ExternalLink"
+        self, link: ExternalLink
     ) -> Union["pyarrow.Table", None]:
         """Create a table from a link."""