Add eg/benchmark.sql

eg/bench.sql

@@ -0,0 +1,72 @@
+-- This script runs a simple benchmark of a CHECK constraint using either
+-- the jsonschema or the pg_jsonschema extension. To test jsonschema for
+-- 200_000 iterations:
+--
+--     psql -f eg/bench.sql --set extension=jsonschema --iterations 200_000
+--
+-- And with pg_jsonschema:
+--
+--     psql -f eg/bench.sql --set extension=pg_jsonschema --iterations 200_000
+--
+-- Borrowed from
+-- https://github.com/supabase/pg_jsonschema?tab=readme-ov-file#benchmark
+
+\set QUIET on
+\unset ECHO
+\pset pager off
+
+\if :{?extension}
+\else
+   \set extension jsonschema
+\endif
+
+\if :{?iterations}
+\else
+   \set iterations 200_000
+\endif
+
+BEGIN;
+
+SELECT '{
+    "type": "object",
+    "properties": {
+        "a": {"type": "number"},
+        "b": {"type": "string"}
+    }
+}' AS schema \gset
+
+CREATE EXTENSION :extension;
+
+CREATE TABLE bench_json(
+    meta JSON CHECK (json_matches_schema(:'schema'::json, meta))
+);
+
+CREATE TABLE bench_jsonb(
+    meta JSON CHECK (json_matches_schema(:'schema'::json, meta))
+);
+
+\timing on
+
+\echo
+\echo ######################################################################
+\echo # Test :extension JSON validation for :iterations iterations
+\echo ######################################################################
+
+INSERT INTO bench_json(meta)
+SELECT json_build_object( 'a', i, 'b', i::text )
+  FROM generate_series(1, :iterations) t(i);
+
+\echo
+\echo
+\echo ######################################################################
+\echo # Test :extension JSONB validation for :iterations iterations
+\echo ######################################################################
+
+INSERT INTO bench_jsonb(meta)
+SELECT json_build_object( 'a', i, 'b', i::text )
+  FROM generate_series(1, :iterations) t(i);
+
+\echo
+\echo
+\timing off
+ROLLBACK;