Re: [PR] fix: customize column description limit size in db_engine_spec [superset]

Thu, 21 Aug 2025 20:57:30 -0700 


korbit-ai[bot] commented on code in PR #34808:
URL: https://github.com/apache/superset/pull/34808#discussion_r2292629334


##########
superset/result_set.py:
##########
@@ -135,21 +135,21 @@ def __init__(  # pylint: disable=too-many-locals  # noqa: 
C901
         if data and (not isinstance(data, list) or not isinstance(data[0], 
tuple)):
             data = [tuple(row) for row in data]
         array = np.array(data, dtype=numpy_dtype)
-        if array.size > 0:
-            for column in column_names:
-                try:
-                    pa_data.append(pa.array(array[column].tolist()))
-                except (
-                    pa.lib.ArrowInvalid,
-                    pa.lib.ArrowTypeError,
-                    pa.lib.ArrowNotImplementedError,
-                    ValueError,
-                    TypeError,  # this is super hackey,
-                    # https://issues.apache.org/jira/browse/ARROW-7855
-                ):
-                    # attempt serialization of values as strings
-                    stringified_arr = stringify_values(array[column])
-                    pa_data.append(pa.array(stringified_arr.tolist()))
+
+        for column in column_names:
+            try:
+                pa_data.append(pa.array(array[column].tolist()))
+            except (
+                pa.lib.ArrowInvalid,
+                pa.lib.ArrowTypeError,
+                pa.lib.ArrowNotImplementedError,
+                ValueError,
+                TypeError,  # this is super hackey,
+                # https://issues.apache.org/jira/browse/ARROW-7855
+            ):
+                # attempt serialization of values as strings
+                stringified_arr = stringify_values(array[column])
+                pa_data.append(pa.array(stringified_arr.tolist()))

Review Comment:
   ### Inefficient Array Type Conversions <sub>![category 
Performance](https://img.shields.io/badge/Performance-4f46e5)</sub>
   
   <details>
     <summary>Tell me more</summary>
   
   ###### What is the issue?
   Converting array to list then back to Arrow array with intermediate 
stringification creates unnecessary memory allocations.
   
   
   ###### Why this matters
   Multiple conversions between array types and unnecessary string conversions 
can significantly impact performance with large datasets.
   
   ###### Suggested change ∙ *Feature Preview*
   Try to minimize conversions by directly creating Arrow arrays or batching 
conversions:
   ```python
   # Convert data directly to Arrow array when possible
   try:
       pa_data.append(pa.array(array[column], type=infer_arrow_type(column)))
   except:
       # Fallback to string conversion only when necessary
       stringified_arr = stringify_values(array[column])
       pa_data.append(pa.array(stringified_arr))
   ```
   
   
   ###### Provide feedback to improve future suggestions
   [![Nice 
Catch](https://img.shields.io/badge/👍%20Nice%20Catch-71BC78)](https://app.korbit.ai/feedback/aa91ff46-6083-4491-9416-b83dd1994b51/05549741-5b18-4ae6-9d4e-dc5f742e3263/upvote)
 
[![Incorrect](https://img.shields.io/badge/👎%20Incorrect-white)](https://app.korbit.ai/feedback/aa91ff46-6083-4491-9416-b83dd1994b51/05549741-5b18-4ae6-9d4e-dc5f742e3263?what_not_true=true)
  [![Not in 
Scope](https://img.shields.io/badge/👎%20Out%20of%20PR%20scope-white)](https://app.korbit.ai/feedback/aa91ff46-6083-4491-9416-b83dd1994b51/05549741-5b18-4ae6-9d4e-dc5f742e3263?what_out_of_scope=true)
 [![Not in coding 
standard](https://img.shields.io/badge/👎%20Not%20in%20our%20standards-white)](https://app.korbit.ai/feedback/aa91ff46-6083-4491-9416-b83dd1994b51/05549741-5b18-4ae6-9d4e-dc5f742e3263?what_not_in_standard=true)
 
[![Other](https://img.shields.io/badge/👎%20Other-white)](https://app.korbit.ai/feedback/aa91ff46-6083-4491-9416-b83dd1994b51/05549741-5b18-4ae6-9d4e-dc5f742e3263)
   </details>
   
   <sub>
   
   💬 Looking for more details? Reply to this comment to chat with Korbit.
   </sub>
   
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