Aleksandr created IGNITE-27514:
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Summary: CLI: Integrate pager for large output handling in REPL
Key: IGNITE-27514
URL: https://issues.apache.org/jira/browse/IGNITE-27514
Project: Ignite
Issue Type: Improvement
Reporter: Aleksandr
Implement pager integration for CLI REPL mode to handle large outputs (SQL
results, execution plans, config dumps).
_Problem:_
Large outputs scroll past without control, making it impossible to review
execution plans, large query results, or configuration dumps.
_Solution:_
Pipe outputs exceeding terminal height through a pager (less, more, or user's
$PAGER).
_Implementation approach:_
* Use CommandLineContextProvider.setPrintWrapper() to intercept output
* Capture output to StringWriter, compare line count vs terminal.getHeight()
* If exceeds threshold, spawn pager process and pipe output
* Fallback to direct print if pager unavailable
_New config keys:_
* ignite.cli.pager.enabled (boolean, default: true)
* ignite.cli.pager.command (string, default: "less -RFX")
_Platform support:_
* Linux/macOS: less -RFX (default)
* Windows: more (fallback)
* Respect $PAGER environment variable
_Key files:_
* CliConfigKeys.java - config keys
* PagerSupport.java (new) - pager utility
* ReplExecutorImpl.java - print wrapper setup
* AbstractCallExecutionPipeline.java - route output through wrapper
_Requirements:_
* Must work in Docker containers (detect if pager available)
* REPL mode only for initial implementation
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