[HUDI-6668] CTAS should not clear existing hoodie table path

[wecharyu]

Change Logs

Currently Hudi will clear table path if there is any exception in CTAS command:

hudi/hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/spark/sql/hudi/command/CreateHoodieTableAsSelectCommand.scala

Lines 117 to 121 in 7102e0f

	} catch {
	case e: Throwable => // failed to insert data, clear table path
	clearTablePath(tablePath, hadoopConf)
	throw e
	}

It may mistakenly delete the path belongs to another hudi table, we need a check before the clear.

Impact

CTAS will not clear the table path which is not generated by it any more.

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

low

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the
  ticket number here and follow the instruction to make
  changes to the website.

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:

• f643044 Azure: SUCCESS

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