[TRAFODION-3264] eliminate unneeded function call in Lob-related functions

[wenjun-zhu]

in file core/sql/executor/ExExeUtilLoad.cpp, lines like:

	    ex_expr::exp_return_type exprRetCode =	
	      lobTdb().inputExpr_->eval(NULL, 	
					workAtp_);

call function eval(), with first parameter NULL.

Then code in ex_expr::evalClauses() accesses NULL pointer, so the server aborts.

As @sandhyasun said, this invocation is unneeded, so remove these code.

[Traf-Jenkins]

Can one of the admins verify this patch?

[Traf-Jenkins]

Can one of the admins verify this patch?

[Traf-Jenkins]

Check Test Started: https://jenkins.esgyn.com/job/Check-PR-master/3113/

[Traf-Jenkins]

Can one of the admins verify this patch?

[Traf-Jenkins]

Test Passed. https://jenkins.esgyn.com/job/Check-PR-master/3113/

[sandhyasun]

Did you run all the extract commands and "update lob" commands and ensure this expression eval can be eliminated ? Did executor/TEST130 pass ? And the JDBC LOB tests that are part of regressions ? They go through this code path.

[sandhyasun]

We can merge this in if we get the results on executor/TEST130 and the JDBC lob tests. Please update this PR with the results.