Fix oracle bulk insert issue when leftover chunk is empty

[mfatemipour]

---

In bulk_insert_rows method of oracle hook, if number of rows is equal to chunk size, then leftover of chunk is 0, and code will fail, I've just checked the size of leftover before executing query.

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[potiuk]

Could you please add unit test for that one?

[romsharon98]

From what I looked, row_chunk can be empty only if rows is empty and that cannot happen because an exception will be raised.

So this if statement has no effect.

[mfatemipour]

Here if size of rows is equal to (or a multiple of) commit_every, then on the last iteration of the loop,if statement will be executed and row_chunk will get empty.

        row_count = 0
        # Chunk the rows
        row_chunk = []
        for row in rows:
            row_chunk.append(row)
            row_count += 1
            if row_count % commit_every == 0:
                cursor.prepare(prepared_stm)
                cursor.executemany(None, row_chunk)
                conn.commit()  # type: ignore[attr-defined]
                self.log.info("[%s] inserted %s rows", table, row_count)
                # Empty chunk
                row_chunk = []

[romsharon98]

Here if size of rows is equal to (or a multiple of) commit_every, then on the last iteration of the loop,if statement will be executed and row_chunk will get empty.

        row_count = 0
        # Chunk the rows
        row_chunk = []
        for row in rows:
            row_chunk.append(row)
            row_count += 1
            if row_count % commit_every == 0:
                cursor.prepare(prepared_stm)
                cursor.executemany(None, row_chunk)
                conn.commit()  # type: ignore[attr-defined]
                self.log.info("[%s] inserted %s rows", table, row_count)
                # Empty chunk
                row_chunk = []

Oh I missed this, thanks!
I added a tests to this PR with cherry-pick from your commit so it can be merged.
#43467