sql: code generation for missing pg catalog tables

Previously, programmer had to add missing table manually,
This was inadequate because postgress added a lot of tables and
manual process can lead to coding mistakes or gaps
To address this, diff tool now have the hability to generate the
missing code

Release note: None

Fixes #58001

pkg/sql/BUILD.bazel

@@ -598,6 +598,7 @@ go_test(
         "@com_github_jackc_pgx//pgtype",
         "@com_github_jackc_pgx_v4//:pgx",
         "@com_github_lib_pq//:pq",
+        "@com_github_lib_pq//oid",
         "@com_github_pmezard_go_difflib//difflib",
         "@com_github_stretchr_testify//assert",
         "@com_github_stretchr_testify//require",

pkg/sql/pg_catalog_diff.go

@@ -17,6 +17,9 @@ import (
 	"encoding/json"
 	"io"
 	"os"
+
+	"github.com/cockroachdb/cockroach/pkg/sql/types"
+	"github.com/lib/pq/oid"
 )
 
 // GetPGCatalogSQL is a query uses udt_name::regtype instead of data_type column because
@@ -185,6 +188,30 @@ func (p PGCatalogTables) rewriteDiffs(diffFile string) error {
 	return nil
 }
 
+// getNotImplementedTables retrieves tables that are not yet part of crdb
+func (p PGCatalogTables) getNotImplementedTables(source PGCatalogTables) PGCatalogTables {
+	notImplemented := make(PGCatalogTables)
+	for tableName := range p {
+		if len(p[tableName]) == 0 && len(source[tableName].getNotImplementedTypes()) == 0 {
+			notImplemented[tableName] = source[tableName]
+		}
+	}
+	return notImplemented
+}
+
+//AreAllTypesImplemented verifies that all the types are implemented in cockroach db
+func (c PGCatalogColumns) getNotImplementedTypes() map[oid.Oid]string {
+	notImplemented := make(map[oid.Oid]string)
+	for _, column := range c {
+		typeOid := oid.Oid(column.Oid)
+		if _, ok := types.OidToType[typeOid]; !ok || typeOid == oid.T_anyarray {
+			notImplemented[typeOid] = column.DataType
+		}
+	}
+
+	return notImplemented
+}
+
 // Save have the purpose of storing all the data retrieved from postgres and useful information as postgres version
 func (f *PGCatalogFile) Save(writer io.Writer) {
 	byteArray, err := json.MarshalIndent(f, "", "  ")