[BUG]ppl parse issue for backtick wrapped fields

[YANG-DB]

What is the bug?
the next query

source = mys3.default.http_logs_plain | 
where status >= 400 | sort - `@timestamp` | head 5

fails with the next error

"error": "Fail to analyze query. Cause: Column '```@timestamp```' does not exist. Did you mean one of the following? [spark_catalog.default.http_logs_plain.day, spark_catalog.default.http_logs_plain.month, spark_catalog.default.http_logs_plain.size, spark_catalog.default.http_logs_plain.year, spark_catalog.default.http_logs_plain.status, spark_catalog.default.http_logs_plain.@timestamp, spark_catalog.default.http_logs_plain.request, spark_catalog.default.http_logs_plain.clientip];\n'Project [*]\n+- 'GlobalLimit 5\n   +- 'LocalLimit 5\n      +- 'Sort ['`@timestamp` DESC NULLS LAST], true\n         +- Filter (status#75 >= 400)\n            +- SubqueryAlias spark_catalog.default.http_logs_plain\n               +- Relation default.http_logs_plain[@timestamp#72,clientip#73,request#74,status#75,size#76,year#77,month#78,day#79] json\n"

What is the expected behavior?
Parsing of single quote should work correctly

Do you have any screenshots?

Do you have any additional context?

• https://github.com/opensearch-project/opensearch-spark/tree/main/ppl-spark-integration