ZhangYu0123 commented on code in PR #18692:
URL: https://github.com/apache/doris/pull/18692#discussion_r1168181847
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be/src/vec/functions/function_string.h:
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@@ -2292,30 +2292,76 @@ class FunctionStringLocatePos : public IFunction {
Status execute_impl(FunctionContext* context, Block& block, const
ColumnNumbers& arguments,
size_t result, size_t input_rows_count) override {
- auto col_substr =
-
block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();
- auto col_str =
+ const auto& left = block.get_by_position(arguments[0]);
+ const auto& right =
Review Comment:
> maybe the right column seems more likely to be constant? If so, we should
optimize for `rcol` but not `lcol` and use
`default_preprocess_parameter_columns` to deal with other columns. Then our
dispatcher could distinguish by wether `lcol` and `pos` are all const.
locale(subStr, str, pos) , this function parameter is subStr, str, pos.
On one hand, subStr is likely to be constant.
On the other hand, because of init stringsearch is a waste of time, so
optimize left col is more benefit than the right col.
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