Using SQLite 3.22.0

In my app I have code to determine if a given SQL string is data-producing,
non-data producing or invalid. It uses these 3 SQLite functions:

sqlite3_prepare_v3
sqlite3_stmt_readonly
sqlite3_column_count

Have been using this code for a few years and sofar never failed, but now
come across:
pragma index_list
so, without a supplied table name.
This gives me data-producing and I think it should give me invalid.

Firstly is this SQL indeed invalid?

Secondly, if it is I need to add some code to pick this up and was thinking
about using explain for that. Explain pragma index_list gives me:

addr opcode p1 p2 p3 p4 p5 comment
---------------------------------------------------
0 Init 0 1 0  00 Start at 1
1 Halt 0 0 0  00

And that to me looks it is indeed an invalid SQL as it gives a Halt already
in the second row
and produces no further rows.

Am I right here and would this be a good way to pick up invalid SQL?


RBS
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