Method of

core/src/main/java/org/apache/calcite/rex/RexInputRef.java:87–89

Creates a reference to a given field in a row type.

(int index, RelDataType rowType)

   * Creates a reference to a given field in a row type.
   */
  public static RexInputRef of(int index, RelDataType rowType) {
    return of(index, rowType.getFieldList());
  }

  /**
   * Creates a reference to a given field in a list of fields.