Expose TableFragmentType via a Replace flag

[w1ndy]

Pull Request Description

This PR proposes a fix for #73 . Table fragments of type DataReplace should cause the existing result set to be replaced with new one; otherwise, the obtained query result may contain duplicated entries. To make users aware of this, this PR adds a flag called Replace in struct Row to indicate that the existing result set should be emptied before adding this row to the set.

---

Future Release Comment

Breaking Changes:

• The new Replace flag in struct Row should be handled to avoid duplicated entries in the result set. Adding the following code to handle the Replace flag in the iter.Do calls is recommended:

  var results []Result
  iter.Do(
      func(row *table.Row) error {
    	  // result := ...
    	  if row.Replace {
    		  results = results[:0]
    	  }
    	  results = append(results, result)
    	  return nil
      },
  )

Fixes:

• Fix duplicated entries caused by TableFragmentType (TableFragmentType == DataReplace is not correctly handled #73)

[codecov-commenter]

Codecov Report

Merging #74 (e1a211d) into master (02c5c0e) will increase coverage by 2.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   50.29%   52.35%   +2.05%     
==========================================
  Files          28       30       +2     
  Lines        4096     4273     +177     
==========================================
+ Hits         2060     2237     +177     
+ Misses       1890     1877      -13     
- Partials      146      159      +13     

Impacted Files	Coverage Δ
kusto/data/table/table.go	32.25% <ø> (ø)
kusto/reader.go	65.24% <100.00%> (ø)
kusto/statemachine.go	72.61% <100.00%> (ø)
kusto/mock.go	50.00% <0.00%> (-13.77%)	⬇️
kusto/test/etoe/etoe_env.go	42.00% <0.00%> (-6.00%)	⬇️
kusto/ingest/internal/filesystem/filesystem.go	26.80% <0.00%> (-1.12%)	⬇️
kusto/ingest/streaming.go	63.21% <0.00%> (ø)
kusto/ingest/file_options.go	25.89% <0.00%> (ø)
kusto/ingest/internal/conn/conn.go	66.10% <0.00%> (+0.36%)	⬆️
kusto/ingest/result.go	6.95% <0.00%> (+6.95%)	⬆️
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b89f168...e1a211d. Read the comment docs.

[AsafMah]

Overall looks good, just needs a test in statemachine_test.go

[w1ndy]

@AsafMah Thanks for your review! I've added a simple test to statemachine_test.go. Could you help me review again?

[w1ndy]

@AsafMah Good suggestion, I have added the test

[AsafMah]

🚀