ZGLanguage 解析SQL数据血缘 之 提取select语句中的源表名

假设存在 SQL代码 如下：

SELECT CL.OBJECTNO
     , AL.PAYDATE
  FROM NYBDP.O_SS_CL_LOAN_ACCT_STATIS CL
 inner JOIN O_CWWS_ACCT_LOAN AL
    ON 1=1
  LEFT out JOIN NYBDP.O_CWWS_BUSINESS_DUEBILL BD
    ON 1=1
  LEFT JOIN O_CWWS_BUSINESS_CONTRACT BC
    ON 1=1
;

若要提取以上SQL代码中的源表名，可配置语法标注"源表"如下：

__DEF_CASE_SENSITIVE__    N

__DEF_PATH__    __SELECT__
1             : x1            @          | select
N             : x2            @          | __OTH_COL__
e             : x3            @          | ,
1             : x4            @          | from
              : x5            @          | __TABLE_NAME__
N             : x6            @          | __JOIN_TABLE__


__DEF_SUB_PATH__   __OTH_COL__
1       : x1          | __NAME__
        : x2          | .
        : x3          | __NAME__


__DEF_SUB_PATH__       __TABLE_NAME__
1        : 源表           @           | __NAME__
+        : schema         @           | __NAME__
         : pp             @           | .
         : 源表_2         @           | __NAME__
1        : as             @ CAN_SKIP  | as
         : 源表别名       @ CAN_SKIP  | __NAME__


__DEF_SUB_PATH__    __JOIN_TABLE__
1             : x0      @                | join
+             : x1      @                | inner
              : x2      @                | join
+             : x5      @                | left
              : x6      @ CAN_SKIP       | out
              : x7      @                | join
+             : x12     @                | right
              : x13     @ CAN_SKIP       | out
              : x14     @                | join
+             : x17     @                | full
              : x18     @ CAN_SKIP       | out
              : x19     @                | join
+             : x20     @                | ,
1             : x21     @                | __TABLE_NAME__
              : x22     @                | on
              : x23     @                | 1=1


__DEF_STR__   __NAME__
<1,100>
[1,1]ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_??
[0,100]ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_??
[NO] select inner left join on from where group order by having union all with as table

根据语法配置解析结果(导入Excel)如下所示：

由以上解析结果红色部分所示，根据 标注 列进行"源表"筛选，可以得到select语句中的4张源表名。