Add full query decoding benchmarks

integration_benchmark_test.go.erb

@@ -0,0 +1,44 @@
+// Code generated by erb. DO NOT EDIT.
+
+package pgtype_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/jackc/pgtype/testutil"
+	"github.com/jackc/pgx/v4"
+)
+
+<%
+  [
+    ["int4", ["int16", "int32", "int64", "uint64", "pgtype.Int4"], [[1, 1], [1, 10], [10, 1], [100, 10]]],
+    ["numeric", ["int64", "float64", "pgtype.Numeric"], [[1, 1], [1, 10], [10, 1], [100, 10]]],
+  ].each do |pg_type, go_types, rows_columns|
+%>
+<% go_types.each do |go_type| %>
+<% rows_columns.each do |rows, columns| %>
+<% [["Text", "pgx.TextFormatCode"], ["Binary", "pgx.BinaryFormatCode"]].each do |formatName, formatCode| %>
+func BenchmarkQuery<%= formatName %>FormatDecode_PG_<%= pg_type %>_to_Go_<%= go_type.gsub(/\W/, "_") %>_<%= rows %>_rows_<%= columns %>_columns(b *testing.B) {
+	conn := testutil.MustConnectPgx(b)
+	defer testutil.MustCloseContext(b, conn)
+
+	b.ResetTimer()
+	var v [<%= columns %>]<%= go_type %>
+	for i := 0; i < b.N; i++ {
+		_, err := conn.QueryFunc(
+			context.Background(),
+			`select <% columns.times do |col_idx| %><% if col_idx != 0 %>, <% end %>n::<%= pg_type %> + <%= col_idx%><% end %> from generate_series(1, <%= rows %>) n`,
+      []interface{}{pgx.QueryResultFormats{<%= formatCode %>}},
+			[]interface{}{<% columns.times do |col_idx| %><% if col_idx != 0 %>, <% end %>&v[<%= col_idx%>]<% end %>},
+			func(pgx.QueryFuncRow) error { return nil },
+		)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+<% end %>
+<% end %>
+<% end %>
+<% end %>

integration_benchmark_test_gen.sh

@@ -0,0 +1,2 @@
+erb integration_benchmark_test.go.erb > integration_benchmark_test.go
+goimports -w integration_benchmark_test.go