Map Thrift operation type to proto Operation.Type enum

- Convert TOperationType (Thrift) to proto Operation.Type names
- EXECUTE_STATEMENT remains EXECUTE_STATEMENT
- GET_TYPE_INFO -> LIST_TYPE_INFO
- GET_CATALOGS -> LIST_CATALOGS
- GET_SCHEMAS -> LIST_SCHEMAS
- GET_TABLES -> LIST_TABLES
- GET_TABLE_TYPES -> LIST_TABLE_TYPES
- GET_COLUMNS -> LIST_COLUMNS
- GET_FUNCTIONS -> LIST_FUNCTIONS
- UNKNOWN -> TYPE_UNSPECIFIED

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: samikshya-db

lib/DBSQLOperation.ts

@@ -13,6 +13,7 @@ import IOperation, {
 import {
   TGetOperationStatusResp,
   TOperationHandle,
+  TOperationType,
   TTableSchema,
   TSparkDirectResults,
   TGetResultSetMetadataResp,
@@ -51,6 +52,38 @@ async function delay(ms?: number): Promise<void> {
   });
 }
 
+/**
+ * Map Thrift TOperationType to proto Operation.Type enum string.
+ * Proto values: EXECUTE_STATEMENT=3, LIST_TYPE_INFO=7, LIST_CATALOGS=8, etc.
+ */
+function mapOperationTypeToProto(operationType?: TOperationType): string | undefined {
+  if (operationType === undefined) {
+    return undefined;
+  }
+
+  switch (operationType) {
+    case TOperationType.EXECUTE_STATEMENT:
+      return 'EXECUTE_STATEMENT';
+    case TOperationType.GET_TYPE_INFO:
+      return 'LIST_TYPE_INFO';
+    case TOperationType.GET_CATALOGS:
+      return 'LIST_CATALOGS';
+    case TOperationType.GET_SCHEMAS:
+      return 'LIST_SCHEMAS';
+    case TOperationType.GET_TABLES:
+      return 'LIST_TABLES';
+    case TOperationType.GET_TABLE_TYPES:
+      return 'LIST_TABLE_TYPES';
+    case TOperationType.GET_COLUMNS:
+      return 'LIST_COLUMNS';
+    case TOperationType.GET_FUNCTIONS:
+      return 'LIST_FUNCTIONS';
+    case TOperationType.UNKNOWN:
+    default:
+      return 'TYPE_UNSPECIFIED';
+  }
+}
+
 export default class DBSQLOperation implements IOperation {
   private readonly context: IClientContext;
 
@@ -515,7 +548,7 @@ export default class DBSQLOperation implements IOperation {
       telemetryEmitter.emitStatementStart({
         statementId: this.id,
         sessionId: this.sessionId || '',
-        operationType: this.operationHandle.operationType?.toString(),
+        operationType: mapOperationTypeToProto(this.operationHandle.operationType),
       });
     } catch (error: any) {
       this.context.getLogger().log(LogLevel.debug, `Error emitting statement.start event: ${error.message}`);