Right now PREWHERE in ParquetReaderV3 is implemented in a single step (actually two steps, one of them is row-level security): link. This simplifies implementation, but not that effective, because during query analysis ClickHouse push ALL conditions to PREWHERE: setting + usage.

The idea is to implement Multistage PREWHERE similar to what MergeTree has.

Workaround solution is to disable move_all_conditions_to_prewhere for parquet and move only best condition to PREWHERE.