COGP / FILE ANALYSIS

Layout inspector

Inspect physical placement and measure spatial reads.

Demos ↗

Opening dataset…

01 / QUERY AREA

Spatial query

Row group Page BBOX Read
Attributes · None

Draw a rectangle to measure a read. Level and overview changes repeat it; apply attribute changes when ready.

02 / PHYSICAL BYTES

Physical file layout

The file strip is proportional to byte offset. Click a row group to inspect its columns. Orange shows row groups touched by the query.

Entire file

Row groups · Page indexes · Footer
0end

Selected row group

Choose a row group above.
/ –
Column chunkPosition in row groupSize
Hover over the file strip or a column for byte offsets.
03 / READ COST

BBOX query cost

Fetched bytes and requests are measured from the real read. Page sizes describe physical pages touched; Full RG data is the size of all columns in those row groups.

Draw a rectangle on the map to inspect transfer, geometry, and BBOX page costs.

04 / PAGE INDEX

Column pages

Select a row group to inspect its column pages.