wecharyu commented on code in PR #48468:
URL: https://github.com/apache/arrow/pull/48468#discussion_r2623788355
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cpp/src/parquet/arrow/writer.cc:
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@@ -395,15 +395,24 @@ class FileWriterImpl : public FileWriter {
RETURN_NOT_OK(CheckClosed());
RETURN_NOT_OK(table.Validate());
- if (chunk_size <= 0 && table.num_rows() > 0) {
- return Status::Invalid("chunk size per row_group must be greater than
0");
- } else if (!table.schema()->Equals(*schema_, false)) {
+ if (!table.schema()->Equals(*schema_, false)) {
return Status::Invalid("table schema does not match this writer's.
table:'",
table.schema()->ToString(), "' this:'",
schema_->ToString(),
"'");
} else if (chunk_size > this->properties().max_row_group_length()) {
chunk_size = this->properties().max_row_group_length();
}
+ // max_row_group_bytes is applied only after the row group has accumulated
data.
+ if (row_group_writer_ != nullptr && row_group_writer_->num_rows() > 0) {
+ double avg_row_size = row_group_writer_->current_buffered_bytes() * 1.0 /
+ row_group_writer_->num_rows();
+ chunk_size = std::min(
+ chunk_size,
+ static_cast<int64_t>(this->properties().max_row_group_bytes() /
avg_row_size));
Review Comment:
Actually each batch will be written to a new row group, we just use the
`avg_row_bytes` to estimate batch_size, and the data will not be appended to
existing row group.
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