amorynan commented on code in PR #15966:
URL: https://github.com/apache/doris/pull/15966#discussion_r1083389580
##########
be/src/olap/rowset/segment_v2/column_writer.cpp:
##########
@@ -173,6 +173,119 @@ Status ColumnWriter::create(const ColumnWriterOptions&
opts, const TabletColumn*
*writer = std::move(writer_local);
return Status::OK();
}
+ case FieldType::OLAP_FIELD_TYPE_MAP: {
+ DCHECK(column->get_subtype_count() == 2);
+ // todo . here key and value is array only?
+ const TabletColumn& key_column = column->get_sub_column(0); //
field_type is true key and value
+ const TabletColumn& value_column = column->get_sub_column(1);
+
+ // create null writer
+ ScalarColumnWriter* null_writer = nullptr;
+ if (opts.meta->is_nullable()) {
+ FieldType null_type = FieldType::OLAP_FIELD_TYPE_TINYINT;
+ ColumnWriterOptions null_options;
+ null_options.meta = opts.meta->add_children_columns();
+ null_options.meta->set_column_id(3);
+ null_options.meta->set_unique_id(3);
+ null_options.meta->set_type(null_type);
+ null_options.meta->set_is_nullable(false);
+ null_options.meta->set_length(
+
get_scalar_type_info<OLAP_FIELD_TYPE_TINYINT>()->size());
+ null_options.meta->set_encoding(DEFAULT_ENCODING);
+ null_options.meta->set_compression(opts.meta->compression());
+
+ null_options.need_zone_map = false;
+ null_options.need_bloom_filter = false;
+ null_options.need_bitmap_index = false;
+
+ TabletColumn null_column = TabletColumn(
+ OLAP_FIELD_AGGREGATION_NONE, null_type, false,
+ null_options.meta->unique_id(),
null_options.meta->length());
+ null_column.set_name("nullable");
+ null_column.set_index_length(-1); // no short key index
+ std::unique_ptr<Field>
null_field(FieldFactory::create(null_column));
+ null_writer =
+ new ScalarColumnWriter(null_options,
std::move(null_field), file_writer);
+ }
+
+ // create key writer
+ std::unique_ptr<ColumnWriter> key_writer;
+ ColumnWriterOptions key_opts;
+ TabletColumn key_list_column(OLAP_FIELD_AGGREGATION_NONE,
OLAP_FIELD_TYPE_ARRAY);
+ {
+
key_list_column.add_sub_column(const_cast<TabletColumn&>(key_column));
+// key_list_column.add_sub_column(key_column);
+ key_list_column.set_name("map.key");
+ key_list_column.set_index_length(-1);
+
+
+ key_opts.meta = opts.meta->mutable_children_columns(0);
Review Comment:
but I need make new array columns as map key and value column writer because
I need wrap actually typed column with array column which actually may not init
in init_column_meta(), what shoud I deal with the
column_id/unique_id/encoding/compression?
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