sql: Add telemetry for parsable plpgsql statements

Release note: None

pkg/BUILD.bazel

@@ -1627,6 +1627,7 @@ GO_TARGETS = [
     "//pkg/sql/plpgsql/parser/lexbase:lexbase",
     "//pkg/sql/plpgsql/parser:parser_test",
     "//pkg/sql/plpgsql/parser:plpgparser",
+    "//pkg/sql/plpgsql/plpgsqltelemetry:plpgsqltelemetry",
     "//pkg/sql/privilege:privilege",
     "//pkg/sql/privilege:privilege_test",
     "//pkg/sql/protoreflect/test:test",
@@ -2755,6 +2756,7 @@ GET_X_DATA_TARGETS = [
     "//pkg/sql/physicalplan/replicaoracle:get_x_data",
     "//pkg/sql/plpgsql/parser:get_x_data",
     "//pkg/sql/plpgsql/parser/lexbase:get_x_data",
+    "//pkg/sql/plpgsql/plpgsqltelemetry:get_x_data",
     "//pkg/sql/privilege:get_x_data",
     "//pkg/sql/protoreflect:get_x_data",
     "//pkg/sql/protoreflect/test:get_x_data",

pkg/sql/catalog/funcinfo/BUILD.bazel

@@ -0,0 +1 @@
+load("//build/bazelutil/unused_checker:unused.bzl", "get_x_data")

pkg/sql/parser/testdata/create_function_plpgsql

@@ -0,0 +1,4 @@
+parse
+CREATE OR REPLACE FUNCTION f(a int = 7) RETURNS INT AS 'SELECT 1' LANGUAGE SQL
+----
+

pkg/sql/plpgsql/parser/parser_test.go

@@ -42,7 +42,6 @@ func TestParseDataDriver(t *testing.T) {
 				if err != nil {
 					d.Fatalf(t, "unexpected parse error: %v", err)
 				}
-
 				return fn.String()
 			}
 			d.Fatalf(t, "unsupported command: %s", d.Cmd)

pkg/sql/plpgsql/plpgsqltelemetry/BUILD.bazel

@@ -0,0 +1,12 @@
+load("//build/bazelutil/unused_checker:unused.bzl", "get_x_data")
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "plpgsqltelemetry",
+    srcs = ["stmt_tags.go"],
+    importpath = "github.com/cockroachdb/cockroach/pkg/sql/plpgsql/plpgsqltelemetry",
+    visibility = ["//visibility:public"],
+    deps = ["//pkg/server/telemetry"],
+)
+
+get_x_data(name = "get_x_data")

pkg/sql/plpgsql/plpgsqltelemetry/stmt_tags.go

@@ -0,0 +1,6 @@
+package plpgsqltelemetry
+
+import "github.com/cockroachdb/cockroach/pkg/server/telemetry"
+
+var StmtAssign = telemetry.GetCounter("plpgsql.stmt_assign")
+var StmtCase = telemetry.GetCounter("plpgsql.stmt_case")