sql: add crdb_internal.show_create_all_tables builtin

docs/generated/sql/functions.md

@@ -2311,6 +2311,10 @@ The swap_ordinate_string parameter is a 2-character string naming the ordinates
 </span></td></tr>
 <tr><td><a name="convert_to"></a><code>convert_to(str: <a href="string.html">string</a>, enc: <a href="string.html">string</a>) &rarr; <a href="bytes.html">bytes</a></code></td><td><span class="funcdesc"><p>Encode the string <code>str</code> as a byte array using encoding <code>enc</code>. Supports encodings ‘UTF8’ and ‘LATIN1’.</p>
 </span></td></tr>
+<tr><td><a name="crdb_internal.show_create_all_tables"></a><code>crdb_internal.show_create_all_tables(dbName: <a href="string.html">string</a>) &rarr; <a href="string.html">string</a></code></td><td><span class="funcdesc"><p>Returns a flat log of CREATE table statements followed by
+ALTER table statements that add table constraints. The flat log can be used
+to recreate a database.’</p>
+</span></td></tr>
 <tr><td><a name="decode"></a><code>decode(text: <a href="string.html">string</a>, format: <a href="string.html">string</a>) &rarr; <a href="bytes.html">bytes</a></code></td><td><span class="funcdesc"><p>Decodes <code>data</code> using <code>format</code> (<code>hex</code> / <code>escape</code> / <code>base64</code>).</p>
 </span></td></tr>
 <tr><td><a name="difference"></a><code>difference(source: <a href="string.html">string</a>, target: <a href="string.html">string</a>) &rarr; <a href="string.html">string</a></code></td><td><span class="funcdesc"><p>Convert two strings to their Soundex codes and then reports the number of matching code positions.</p>

pkg/sql/BUILD.bazel

@@ -461,6 +461,7 @@ go_test(
         "scrub_test.go",
         "sequence_test.go",
         "set_zone_config_test.go",
+        "show_create_all_tables_builtin_test.go",
         "show_fingerprints_test.go",
         "show_ranges_test.go",
         "show_stats_test.go",