return the differentiator that can distinguish columns with the same name . this value is just the ordinal position of the schemacolumn within its nodeschema . concode_field_sep String m_tableName concode_elem_sep String m_columnAlias concode_elem_sep int m_differentiator concode_elem_sep AbstractExpression m_expression concode_elem_sep String m_columnName concode_elem_sep String m_tableAlias concode_field_sep SchemaColumn fromJSONObject concode_elem_sep void toJSONString concode_elem_sep String getTableName concode_elem_sep String getColumnName concode_elem_sep SchemaColumn copyAndReplaceWithTVE concode_elem_sep String getColumnAlias concode_elem_sep String getTableAlias concode_elem_sep AbstractExpression getExpression concode_elem_sep int getSize concode_elem_sep VoltType getType concode_elem_sep int hashCode concode_elem_sep String toExplainPlanString concode_elem_sep boolean equals concode_elem_sep SchemaColumn clone concode_elem_sep int nullSafeStringCompareTo concode_elem_sep void reset concode_elem_sep String toString concode_elem_sep void setDifferentiator concode_elem_sep int compareNames
int function ( ) { return m_differentiator ; }