investigate performance differences between ogr and pg_sheet and also between different orders of tpch query executions.

[Hyrikan]

• [x] execute tpch queries for ogr, pg_sheet and base multiple times in a row
• [ ] Test different Sheetreader parallelism parameters (and maybe batch size)

[Hyrikan]

first fix the last error with reading sheets > 800 000 lines producing a double free in Postgresql.

[Hyrikan]

created all tpch queries for sheet and ogr

[Hyrikan]

investigate strange bad performance of ogr on some queries.

For that test intersecting ogr and sheet table of orders.

Why does ogr read ~700 000 rows of ogr_sf0001_orders?

use explain analyzer: https://explain.dalibo.com