... in the table affected by the change; and *pzTab is set to point to a nul-terminated utf-8 encoded string containing the name of the table affected by the current change. The buffer remains valid until either sqlite3changeset_next() is ... 

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.