[typo](docs)fix dynamic Table version label #16895
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* [WIP](dynamic-table) support dynamic schema table (apache#16335) Issue Number: close apache#16351 Dynamic schema table is a special type of table, it's schema change with loading procedure.Now we implemented this feature mainly for semi-structure data such as JSON, since JSON is schema self-described we could extract schema info from the original documents and inference the final type infomation.This speical table could reduce manual schema change operation and easily import semi-structure data and extends it's schema automatically. * [improve](dynamic-table) change `addColumns` RPC interface fields from `required` to `optional` and and config doc (apache#16632) * [doc](dynamic-table) Add docs for dynamic-table (apache#16669) * [improve](dynamic table) refine SegmentWriter columns writer generate (apache#16816) * [improve](dynamic table) refine SegmentWriter columns writer generate ``` Dynamic Block consists of two parts, dynamic part of columns and static part of columns static dynamic | ----- | ------- | the static ones are original _tablet_schame columns the dynamic ones are auto generated and extended from file scan. ``` **We should only consisder to use Block info to generte columns when it's a dynamic table load procudure.** And seperate the static ones and dynamic ones * test * [typo](docs)fix dynamic Table version label (apache#16895) * [Feature](Dynamic schema table) step1 support schema change expression (apache#17494) 1. introduce a new type `VARIANT` to encapsulate dynamic generated columns for hidding the detail of types and names of newly generated columns 2. introduce a new expression `SchemaChangeExpr` for doing schema change for extensibility * Fix compile * [Bug](dynamic-table) Fix column alignment logic and support filtering null values when slot is not null Before this PR when encountering null values with some columns which is specified as `NOT NULL`, null values will not be filtered,thi behavior does not match with the original load behavior. Second column alignment logic has bug : ``` template <typename ColumnInserterFn> void align_variant_by_name_and_type(ColumnObject& dst, const ColumnObject& src, size_t row_cnt, ColumnInserterFn inserter) { CHECK(dst.is_finalized() && src.is_finalized()); // Use rows() here instead of size(), since size() will check_consistency // but we could not check_consistency since num_rows will be upgraded even // if src and dst is empty, we just increase the num_rows of dst and fill // num_rows of default values when meet new data size_t num_rows = dst.rows(); ``` --------- Co-authored-by: jiafeng.zhang <zhangjf1@gmail.com>
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