spark: add log filter snippet for regex-based log filtering

wizard-work/spark/log_filter.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+"""Quick log filter snippet - filter log lines by regex pattern."""
+
+import re
+import sys
+
+def filter_lines(lines, pattern):
+    """Filter lines matching regex pattern."""
+    regex = re.compile(pattern)
+    return [line for line in lines if regex.search(line)]
+
+if __name__ == "__main__":
+    pattern = sys.argv[1] if len(sys.argv) > 1 else "ERROR"
+    lines = sys.stdin.readlines()
+    for line in filter_lines(lines, pattern):
+        sys.stdout.write(line)