[BUG] Update WindowExpression parser to handle truncated argument list

[nartal1]

Describe the bug
Some eventlogs do not have complete argument list for Window Exec.
For example:

Arguments: [arg1#26, arg2#29L, arg3#30, arg4#31L, arg5#32, arg6#33, arg7#34, arg8#47, arg9#48, arg10#49, arg11#50, arg12#51, arg13#76, ... 52 more fields], [col1#26], [time1#27L ASC NULLS FIRST]

Current WindowParser doesn't handle this case and ends up classifying WindowExec as not supported. For incomplete argumentlist, we should try to get the function names(if present). If there are no function names, then skip parsing that expression.