feat: merge dag sql

[wyl4pd]

sqls: node1: SELECT col1, col2 FROM table1 node2: SELECT col3, col4 FROM table2 node3: SELECT c1.col1, c1.col2, c2.col3, c2.col4 FROM cte1 c1 JOIN cte2 c2 ON c1.col1 = c2.col3

dag: node1: {} node2: {} node3: {cte1: node1, cte2: node2}

tableSchema: table1: ... table2: ...

output: WITH cte1 AS ( SELECT col1, col2 FROM table1 ), cte2 AS ( SELECT col3, col4 FROM table2 ) SELECT c1.col1, c1.col2, c2.col3, c2.col4 FROM cte1 c1 JOIN cte2 c2 ON c1.col1 = c2.col3

[github-actions[bot]]

SDK Test Report

102 files  102 suites   2m 15s :stopwatch: 359 tests 345 :white_check_mark: 14 :zzz: 0 :x: 487 runs  473 :white_check_mark: 14 :zzz: 0 :x:

Results for commit 30614059.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.31034% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 75.19%. Comparing base (d9bb344) to head (3061405). Report is 4 commits behind head on main.

Files	Patch %	Lines
...va/com/_4paradigm/openmldb/sdk/utils/AIOSUtil.java	78.86%	13 Missing and 13 partials :warning:
...paradigm/openmldb/sdk/impl/SqlClusterExecutor.java	81.81%	2 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3911 +/- ## ============================================ + Coverage 74.98% 75.19% +0.21% - Complexity 658 711 +53 ============================================ Files 751 752 +1 Lines 135067 135211 +144 Branches 1501 1535 +34 ============================================ + Hits 101276 101678 +402 + Misses 33503 33230 -273 - Partials 288 303 +15 ```

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Linux Test Report

    59 files     252 suites   1h 47m 55s :stopwatch: 13 509 tests 13 502 :white_check_mark: 7 :zzz: 0 :x: 19 181 runs  19 174 :white_check_mark: 7 :zzz: 0 :x:

Results for commit 30614059.

:recycle: This comment has been updated with latest results.