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This commit adds two new columns to pg_stat_statements, called temp_blk_read_time and temp_blk_write_time. Those columns respectively show the time spent to read and write temporary file blocks on disk, whose tracking has been added in efb0ef9. This information is available when track_io_timing is enabled, like blk_read_time and blk_write_time. pg_stat_statements is updated to version to 1.10 as an effect of the newly-added columns. Tests for the upgrade path 1.9->1.10 are added. PGSS_FILE_HEADER is bumped for the new stats file format. Author: Masahiko Sawada Reviewed-by: Georgios Kokolatos, Melanie Plageman, Julien Rouhaud, Ranier Vilela Discussion: https://postgr.es/m/CAD21AoAJgotTeP83p6HiAGDhs_9Fw9pZ2J=_tYTsiO5Ob-V5GQ@mail.gmail.com