Hi Holyfoot! I've made some changes regarding key_length computation to fix MDEV-6838. Changing this seems to have lead to us discovering another issue outlined in MDEV-7682 (that I've just created).
It seems that the spatial key returns a key_length of 0. I've spoken to Sergei Petrunia and we are not sure about this particular case. pack_length returns a bigger number (12). According to the other comments in the code, pack_length also returns the length field associated with the column, but we are only interested in the length of the column field, without any metadata information. The function TABLE:create_key_part_by_field adds the metadata length itself afterwards. Do you have any input on this issue, namely why the key_length is returned as 0 for the LINESTRING column? Regards, Vicentiu
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