- `projections` — Shows all analyzed projections and their effect on part-level filtering based on projection primary key conditions. For each projection, this section includes statistics such as the number of parts, rows, marks, and ranges that were evaluated using the projection's primary key. It also shows how many data parts were skipped due to this filtering, without reading from the projection itself. Whether a projection was actually used for reading or only analyzed for filtering can be determined by the `description` field. Default: 0. Supported for [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) tables.
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