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new 48937fef485 [Performance](json reader) optimize filling default values
(#25542)
48937fef485 is described below
commit 48937fef485c6a7c79d7c48dc982a84a64f5227c
Author: lihangyu <15605149...@163.com>
AuthorDate: Thu Dec 14 10:20:29 2023 +0800
[Performance](json reader) optimize filling default values (#25542)
Add a faster path for filling default values, since looking up value map is
relatively slow
---
be/src/vec/exec/format/json/new_json_reader.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/be/src/vec/exec/format/json/new_json_reader.cpp
b/be/src/vec/exec/format/json/new_json_reader.cpp
index e7944e2da86..b6d849eef46 100644
--- a/be/src/vec/exec/format/json/new_json_reader.cpp
+++ b/be/src/vec/exec/format/json/new_json_reader.cpp
@@ -1358,6 +1358,12 @@ Status
NewJsonReader::_simdjson_set_column_value(simdjson::ondemand::object* val
continue;
}
auto* slot_desc = slot_descs[i];
+ // Quick path to insert default value, instead of using default values
in the value map.
+ if (_col_default_value_map.empty() ||
+ _col_default_value_map.find(slot_desc->col_name()) ==
_col_default_value_map.end()) {
+
block.get_by_position(i).column->assume_mutable()->insert_default();
+ continue;
+ }
if (!slot_desc->is_materialized()) {
continue;
}
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