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RTree on ESP32 SQLite Version
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Note also that you need to have pragma's enabled, in particular, pragma page_size.  If the page_size cannot be retrieved when you create/connect to the rtree virtual table then you will get an error logged.  Presumably the error may be "blank" if the reason for the error is that there is no error.

use "pragma compile_options;" to find out the options in actual effect rather than the compile options you think are in effect.