Support extracting column name from function for postgresql

infra/binder/src/main/java/org/apache/shardingsphere/infra/binder/context/segment/select/projection/extractor/ProjectionIdentifierExtractEngine.java

@@ -62,7 +62,7 @@ public String getColumnNameFromFunction(final String functionName, final String
     /**
      * Get column name from expression.
      *
-     * @param expressionSegment expression
+     * @param expressionSegment expression segment
      * @return column name
      */
     public String getColumnNameFromExpression(final ExpressionSegment expressionSegment) {