[HUDI-7269] Fallback to key based merge if positions are missing from log block

[jonvex]

Change Logs

Fallback to key based merge if positions are missing from log block

STILL NEED TO ADD TESTS

Impact

positional queries won't fail if a log file is missing positions

Risk level (write none, low medium or high below)

medium

Documentation Update

N/A

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• e50bc34717247521d84a2f7f9a014f3322c37bdd UNKNOWN
• 75d6213f80d3e37c25a7fd57adf12d82b421315a Azure: FAILURE

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