yiguolei commented on code in PR #57702:
URL: https://github.com/apache/doris/pull/57702#discussion_r2558464710
##########
gensrc/proto/segment_v2.proto:
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@@ -246,6 +256,17 @@ message SegmentFooterPB {
// Primary key index meta
optional PrimaryKeyIndexMetaPB primary_key_index_meta = 10;
+
+ // Externalized ColumnMetaPB layout (optional; presence indicates v2 meta
layout available)
+ // Start offset of the contiguous per-column ColumnMetaPB region (absolute
file offset).
+ optional uint64 col_meta_region_start = 11;
+ // Per-column external meta entries, in col_id order. Each entry contains
the top-level
+ // unique id and the serialized length (in bytes) of its ColumnMetaPB in
the external
+ // Column Meta Region.
+ repeated ColumnMetaEntryPB column_meta_entries = 12;
+ // Number of top-level columns in this segment for external meta
addressing (col_id in [0, N)).
+ // Must equal column_meta_entries.size().
+ optional uint32 num_columns = 13;
Review Comment:
看注释num columns 一定跟column_meta_entries.SIZE 相等，我们保存他的意义是什么？
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