The Virtual Table Mechanism Of SQLite
(vtab.html)
2.3.1. Inputs
... If column usage information is needed by the
xFilter method, then the required bits must be encoded into either
the output idxNum field or idxStr content.
2.3.1.1. LIKE, GLOB, REGEXP, and MATCH functions
For the LIKE, GLOB ...
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The SQLite Bytecode Engine
(opcode.html)
2.6. Self-Altering Code
... Another example is the String8 opcode which converts its P4
operand from UTF-8 into the correct database string encoding, then
converts itself into a String opcode.
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