* Parquet Query Planner: plan byte ranges, pre-fetch in parallel.
- parquetPlan() that returns lists of byte ranges to fetch.
- prefetchAsyncBuffer() pre-fetches all byte ranges in parallel.
throws exception if non-pre-fetched slice is requested later.
Do this by passing rowGroupStart and rowGroupEnd for the rows to
fetch within a rowgroup. If a page is outside those bounds, we can
skip the page. Replaces rowLimit.
* Enable readColumn to read all rows
* Refactor readColumn to use hasRowLimit
* Simplify hasRowLimit condition
* Check less common condition first
* add readColumn test files
* implement readColumn tests for undefined rowLimits
* remove unused variable
* return early if no metadata is present
* address tsc warnings
* add comparison
* clarify that undefined is valid for rowLimit
* remove test files
* verify edge case works when rowLimit is undefined
* add test cases for readColumn
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Co-authored-by: Brian Park <park-brian@users.noreply.github.com>
