[GitHub] [arrow] bkietz commented on a change in pull request #8188: ARROW-9924: [C++][Dataset] Enable per-column parallelism for single ParquetFileFragment scans

[GitBox <gi...@apache.org>]

bkietz commented on a change in pull request #8188:
URL: https://github.com/apache/arrow/pull/8188#discussion_r490997910



##########
File path: python/pyarrow/_dataset.pyx
##########
@@ -1899,7 +1912,7 @@ cdef shared_ptr[CScanContext] _build_scan_context(bint use_threads=True,
 
 cdef void _populate_builder(const shared_ptr[CScannerBuilder]& ptr,
                             list columns=None, Expression filter=None,
-                            int batch_size=32*2**10) except *:
+                            int batch_size=2**20) except *:

Review comment:
       will do

##########
File path: python/pyarrow/_dataset.pyx
##########
@@ -1013,27 +1013,36 @@ cdef class ParquetReadOptions(_Weakrefable):
     dictionary_columns : list of string, default None
         Names of columns which should be dictionary encoded as
         they are read.
+    enable_parallel_column_conversion : bool, default False
+        Whether single files may be read in parallel (ignored when reading
+        multiple files to avoid thread contention).

Review comment:
       alright




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org