[ahmedabu98]

Follow-up to #40666. After a multi-line statement, sqlline 1.4's JLine 2 can leave the terminal's interrupt character undefined, so Ctrl+C no longer cancels a running statement. The shell now uses a Unix terminal that always restores the interrupt character it captured at startup.

🤖 Generated with Claude Code

[github-actions]

📋 Review Summary

This PR fixes an issue in the Beam SQL shell where Ctrl+C stops cancelling running queries after a multi-line statement is entered. It works around JLine 2's 1-second stty -a output cache in UnixTerminal by registering an InterruptRestoringTerminal that captures the intr setting once during terminal initialization and reliably restores it after each line read.

🔍 General Feedback

• The root cause analysis of JLine 2's TerminalLineSettings caching interaction with UnixTerminal.disableInterruptCharacter() during multi-line reads is spot on, and the InterruptRestoringTerminal workaround is clean and minimal.
• Removing permitUnusedDeclared "jline:jline:2.14.6" in build.gradle properly reflects the new direct usage of JLine classes in BeamSqlLine.

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.16%. Comparing base (0f1ac43) to head (f1ff505).
⚠️ Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
...ache/beam/sdk/extensions/sql/jdbc/BeamSqlLine.java	50.00%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #40876       +/-   ##
=============================================
+ Coverage          0   64.16%   +64.16%     
- Complexity        0     2359     +2359     
=============================================
  Files             0      321      +321     
  Lines             0    15628    +15628     
  Branches          0     2032     +2032     
=============================================
+ Hits              0    10027    +10027     
- Misses            0     4833     +4833     
- Partials          0      768      +768     

Flag	Coverage Δ
java	64.16% <50.00%> (?)

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