Search query TraceQL is truncated to 1024 characters

[Handy-caT]

For a query longer than 1024 characters, Tempo will return an error:

Error (invalid TraceQL query: parse error at line 1, col 1025: syntax error: unexpected $end). Please check the server logs for more details.

It alsways returns 1025, not real query length (for my example length is 1073).

To Reproduce
Steps to reproduce the behavior:

1. Start Tempo
2. Send a request with query longer than 1024 characters
3. The error is returned

Expected behavior
Any query works.

Environment:

Infrastructure: docker

Additional Context

2024-06-04 12:34:08 level=error ts=2024-06-04T09:34:08.392342793Z caller=search_handlers.go:84 msg="search: parse search request failed" err="invalid TraceQL query: parse error at line 1, col 1025: syntax error: unexpected $end"
2024-06-04 12:34:08 level=info ts=2024-06-04T09:34:08.392377084Z caller=handler.go:133 tenant=single-tenant method=GET traceID=3e4195d536fe281f url="/api/search?q=<query>&limit=20000&spss=3&start=1717488489&end=1717492089" duration=144.542µs response_size=0 status=400

This issue is similar to #3513, but related to whole query lenght, not character attribute names or static values.

[joe-elliott]

That's interesting. The linked PR adds a test that includes queries > 1024:

https://github.com/grafana/tempo/pull/3571/files#diff-d8f0eeb0f51fa96478a53e37dcfc511f62d7b6b34960229c984308f6bf541df6R1171

Likely we're overrunning the same lex buffer in a different way?

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