Files
greptimedb/src
Yingwen f4e22282a4 feat: Region supports reading data with different schema (#342)
* feat(storage): Implement skeleton of ReadResolver

ReadResolver is used to resolve difference between schemas

* feat(storage): Add user_column_end to ReadResover

* feat(storage): Implement Batch::batch_from_parts

Used to construct Batch from parts according to the schema that user
expects to read.

* feat(storage): Compat memtable schema

* feat(storage): Compat parquet file schema

* fix(storage): ReadResolver supports projection under same schema version

Now ReadResolver takes ProjectedSchemaRef as dest schema, and checks
whether a value column is needed by the schema after projection.

* feat(storage): Check whether columns are same columns

is_source_column_readable() takes ColumnMetadata instead of
ColumnSchema, and compares their column id to check whether they are
same columns.

* refactor(storage): Use row_key_end/user_column_end in source_schema

Rename ReadResolver::is_needed to ReadResolver::is_source_needed, and
remove row_key_end/user_column_end from ReadResolver, since they should
be same as source_schema's

* chore(storage): Remove unused codes

* test(storage): Add tests for the resolver

* feat(storage): Returns error on different source and dest column names

* style(storage): Fix clippy

* refactor: Rename ReadResolver to ReadAdapter

* chore(table): Removed unused comment

* refactor: rename to is_source_column_compatible
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