public static SqlNode replaceNodeInfo(SqlNode parseNode, HashBasedTable<String, String, String> mappingTable, String tabAlias) {
        if (parseNode.getKind() == IDENTIFIER) {
            SqlIdentifier sqlIdentifier = (SqlIdentifier) parseNode;


            return sqlIdentifier;
        }
        return parseNode;
    }
parse multi join table name, child query RealTabName is null
@param leftJoin
@param aliasAndRealTabName
core/src/main/java/com/dtstack/flink/sql/util/ParseUtils.java