[GitHub] [arrow] benibus commented on a diff in pull request #35690: GH-35684: [Go][Parquet] Fix nil dereference with nil list array

["benibus (via GitHub)" <gi...@apache.org>]

benibus commented on code in PR #35690:
URL: https://github.com/apache/arrow/pull/35690#discussion_r1199347189


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go/parquet/pqarrow/encode_arrow.go:
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@@ -246,6 +246,10 @@ type binary64arr interface {
 }
 
 func writeDenseArrow(ctx *arrowWriteContext, cw file.ColumnChunkWriter, leafArr arrow.Array, defLevels, repLevels []int16, maybeParentNulls bool) (err error) {
+	if leafArr.Len() == 0 {

Review Comment:
   Can't comment on it directly since it's not in the diff, but it's not immediately obvious to me why we'd handle this case differently: https://github.com/apache/arrow/blob/c8363fa209fed4dfa30a0eee70283d62fc6f1627/go/parquet/pqarrow/encode_arrow.go#L270-L275
   
   Also, it seems like that branch may never be taken now? Unless it's only there to cover an edge-case where `leafArr` was reassigned to an empty storage array after the initial `Len() == 0` check: https://github.com/apache/arrow/blob/c8363fa209fed4dfa30a0eee70283d62fc6f1627/go/parquet/pqarrow/encode_arrow.go#L253-L257



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