test: verify page-in counters stay separate across lua inner statements

Extends fingerprints.test with a stored procedure containing two
distinct inner SQL statements, run multiple times, checking each
inner statement's total_pagein_read/total_pagein_read_io invariants
independently -- a scenario t10 didn't cover since it only exercised
plain top-level SQL, not the lua inner-statement path.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Signed-off-by: Mark Hannum <mhannum@bloomberg.net>

Author: markhannum

tests/fingerprints.test/README

@@ -9,6 +9,11 @@ are not deterministic across environments, the test checks structural
 invariants instead of exact values: total_pagein_read is at least the
 execution count, and total_pagein_read_io never exceeds total_pagein_read.
 
+"t11.req" checks the same page-in invariants for two distinct SQL statements
+executed inside a single stored procedure (Lua inner statements), verifying
+each gets its own independently-tracked page-in counters rather than one
+statement's counters leaking into the other's.
+
 -------------------------------- SPECIAL NOTES --------------------------------
 
 The "t03.req" test file purposely excludes the following fingerprints from its

tests/fingerprints.test/t11.req

@@ -0,0 +1,26 @@
+CREATE TABLE fp_pagein_a(x INTEGER);$$
+CREATE TABLE fp_pagein_b(y INTEGER);$$
+INSERT INTO fp_pagein_a(x) VALUES(1);
+INSERT INTO fp_pagein_a(x) VALUES(2);
+INSERT INTO fp_pagein_b(y) VALUES(10);
+INSERT INTO fp_pagein_b(y) VALUES(20);
+CREATE PROCEDURE fp_pagein_sp VERSION 'test' {
+local function run_and_drain(sql)
+  local q, rc = db:exec(sql)
+  if rc == 0 then
+    local row = q:fetch()
+    while row do
+      row = q:fetch()
+    end
+  end
+end
+local function main()
+  run_and_drain("SELECT * FROM fp_pagein_a ORDER BY x")
+  run_and_drain("SELECT * FROM fp_pagein_b ORDER BY y")
+end}$$
+PUT DEFAULT PROCEDURE fp_pagein_sp 'test'
+EXEC PROCEDURE fp_pagein_sp()
+EXEC PROCEDURE fp_pagein_sp()
+EXEC PROCEDURE fp_pagein_sp()
+SELECT (total_pagein_read >= count) AS reads_ge_count, (total_pagein_read_io <= total_pagein_read) AS io_le_total FROM comdb2_fingerprints WHERE normalized_sql LIKE 'SELECT%fp_pagein_a%';
+SELECT (total_pagein_read >= count) AS reads_ge_count, (total_pagein_read_io <= total_pagein_read) AS io_le_total FROM comdb2_fingerprints WHERE normalized_sql LIKE 'SELECT%fp_pagein_b%';

tests/fingerprints.test/t11.req.out

@@ -0,0 +1,7 @@
+(rows inserted=1)
+(rows inserted=1)
+(rows inserted=1)
+(rows inserted=1)
+(version='test')
+(reads_ge_count=1, io_le_total=1)
+(reads_ge_count=1, io_le_total=1)