[GitHub] [beam] iemejia commented on a change in pull request #15361: [BEAM-12270] TPC-DS: Add schema projection for Parquet source

[GitBox <gi...@apache.org>]

iemejia commented on a change in pull request #15361:
URL: https://github.com/apache/beam/pull/15361#discussion_r697409283



##########
File path: sdks/java/testing/tpcds/src/main/java/org/apache/beam/sdk/tpcds/QueryReader.java
##########
@@ -37,4 +41,20 @@ public static String readQuery(String queryFileName) throws Exception {
     String path = "queries/" + queryFileName + ".sql";
     return Resources.toString(Resources.getResource(path), Charsets.UTF_8);
   }
+
+  /**
+   * Parse query and get all its identifiers.
+   *
+   * @param queryString
+   * @return Set of SQL query identifiers as strings.
+   * @throws SqlParseException
+   */
+  public static Set<String> getQueryIdentifiers(String queryString) throws SqlParseException {
+    SqlParser parser = SqlParser.create(queryString);
+    SqlNode parsedQuery = parser.parseQuery();
+    SqlTransformRunner.SqlIdentifierVisitor sqlVisitor =
+        new SqlTransformRunner.SqlIdentifierVisitor();
+    parsedQuery.accept(sqlVisitor);
+    return sqlVisitor.getIdentifiers();

Review comment:
       oohhh 👍 




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