pitrou commented on a change in pull request #8516:
URL: https://github.com/apache/arrow/pull/8516#discussion_r519886116
##########
File path: cpp/src/parquet/column_writer.cc
##########
@@ -1190,7 +1192,7 @@ class TypedColumnWriterImpl : public ColumnWriterImpl,
public TypedColumnWriter<
int64_t* out_spaced_values_to_write,
int64_t* null_count) {
if (bits_buffer_ == nullptr) {
- if (!level_info_.HasNullableValues()) {
+ if (level_info_.def_level == 0) {
Review comment:
Interesting. Why is a special case needed for this? Would you like to
add a comment?
##########
File path: cpp/src/parquet/column_writer.cc
##########
@@ -1190,7 +1192,7 @@ class TypedColumnWriterImpl : public ColumnWriterImpl,
public TypedColumnWriter<
int64_t* out_spaced_values_to_write,
int64_t* null_count) {
if (bits_buffer_ == nullptr) {
- if (!level_info_.HasNullableValues()) {
+ if (level_info_.def_level == 0) {
Review comment:
Do you also want to check `def_levels` for null/non-null-ness? (debug
mode check perhaps?)
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