- Query "SELECT sum(heap_blks_read), sum(heap_blks_hit), \
- sum(idx_blks_read), sum(idx_blks_hit), \
- sum(toast_blks_read), sum(toast_blks_hit), \
- sum(tidx_blks_read), sum(tidx_blks_hit) \
+ Statement "SELECT coalesce(sum(heap_blks_read), 0) AS heap_read, \
+ coalesce(sum(heap_blks_hit), 0) AS heap_hit, \
+ coalesce(sum(idx_blks_read), 0) AS idx_read, \
+ coalesce(sum(idx_blks_hit), 0) AS idx_hit, \
+ coalesce(sum(toast_blks_read), 0) AS toast_read, \
+ coalesce(sum(toast_blks_hit), 0) AS toast_hit, \
+ coalesce(sum(tidx_blks_read), 0) AS tidx_read, \
+ coalesce(sum(tidx_blks_hit), 0) AS tidx_hit \