zclllyybb opened a new pull request, #66329:
URL: https://github.com/apache/doris/pull/66329

   ## Summary
   
   - Normalize `information_schema.columns.COLUMN_TYPE` for DecimalV2 and 
DecimalV3 to user-facing `decimal(p,s)`.
   - Make `SHOW COLUMNS ... WHERE` return the same canonical type as ordinary 
`SHOW COLUMNS`, including DecimalV3 precision/scale and DATETIMEV2 precision.
   - Scope the metadata lookup by both schema and table, and widen 
`COLUMN_TYPE`/SHOW `Type` metadata to avoid type-text truncation.
   
   ## Testing
   
   - `./build.sh --be --fe` (initial full build)
   - `./build.sh --fe` (after final FE metadata-schema adjustment)
   - `./run-regression-test.sh --run -s test_information_types ...` 
(force-generate and assertion run)
   - `./run-regression-test.sh --run -s test_show_columns_command ...` 
(force-generate and assertion run)
   - `./run-regression-test.sh --run -s test_complextype_information_schema 
...` (force-generate and assertion run)
   


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