Regularize the parquets - nulls and nonulls each come in 3 variants,
with 1, 10 and 99 rows per rowgroup.
All test queries are written against nullsA, no_nullsA.
Next commit will introduce a tool to expand these template queries to
go against the actual tables.
- "fixed_size_binary" -> "binary_10"
- make null parquet use rowgroups of sie 10: first rowgroup
has no nulls, 2nd has all null, 3rd-10th have alternating
nulls
This is prep for making a Postgres layer to use as an oracle
for generating test cases so that we have good coverage before
implementing advanced `xBestIndex` and `xFilter` modes.
Colin Dellow