Fix postgres metadata storage warning logs because of tablename causi…

…ng issues (apache#17351)

extensions-core/postgresql-metadata-storage/src/main/java/org/apache/druid/metadata/storage/postgresql/PostgreSQLConnector.java

@@ -42,6 +42,7 @@
 import java.sql.SQLException;
 import java.util.List;
 import java.util.Locale;
+import java.util.Set;
 
 public class PostgreSQLConnector extends SQLMetadataConnector
 {
@@ -287,4 +288,24 @@ protected boolean connectorIsTransientException(Throwable e)
     }
     return false;
   }
+
+  /**
+   * This method has been overridden to pass lowercase tableName.
+   * This is done because PostgreSQL creates tables with lowercased names unless explicitly enclosed in double quotes.
+   */
+  @Override
+  protected boolean tableHasColumn(String tableName, String columnName)
+  {
+    return super.tableHasColumn(StringUtils.toLowerCase(tableName), columnName);
+  }
+
+  /**
+   * This method has been overridden to pass lowercase tableName.
+   * This is done because PostgreSQL creates tables with lowercased names unless explicitly enclosed in double quotes.
+   */
+  @Override
+  public Set<String> getIndexOnTable(String tableName)
+  {
+    return super.getIndexOnTable(StringUtils.toLowerCase(tableName));
+  }
 }