[SoC] GSoC 2021 - Week 5 Report - Implement pre-sorting methods before GiST index building

[Han Wang]

Hi all,
I am here to share with you my Week4 report. You can also find it at [1]

Coding Week 5 (5th July - 11th July)
<https://trac.osgeo.org/postgis/wiki/ImplementSortingMethodsBeforeGistIndexBuilding#CodingWeek55thJuly-11thJuly>

*Coding Phase *:

   - Check the original paper of GiST in details
   - Check the implementation of GiST in Postgresql
   - Prepare for evaluation of IO access

*Plans for next week*:

   - Do the IO (buffer) access test
   - Prepare for GSOC evaluation
   - Confirm the proper hash function

If you have any questions or suggestions, please let me know! You can reach
me at #postgis channel in matrix.

[1]
https://trac.osgeo.org/postgis/wiki/ImplementSortingMethodsBeforeGistIndexBuilding

Best regards,
Han
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