test: add regression tests for #439 (logical NOT immediately after AND/OR/EQ)

[chenjunwenhao]

Summary

Issue #439 reported that &&! (logical NOT immediately after logical AND, without spaces) failed to compile in QLExpress v4. The root cause was the ANTLR4 lexer's greedy longest-match rule merging &&! into a single OPID token instead of OPID("&&") + BANG("!").

The bug has been fixed in the current main branch (ANTLR4 was replaced with a hand-written lexer that explicitly handles &&, ||, ==, != as 2-character tokens). However, no regression tests existed for this edge case.

This PR adds 11 regression tests to prevent future regressions.

Changes

New file: src/test/java/com/alibaba/qlexpress4/test/issue/Issue439RegressionTest.java

Lexer-level tests (3)

Test	Expression	Expected Tokens
lexerShouldSplitAndBangIntoOpidAndBang	&&!	OPID(&&) + BANG(!)
lexerShouldSplitOrBangIntoOpidAndBang	||!	OPID(||) + BANG(!)
lexerShouldSplitEqBangIntoOpidAndBang	==!	OPID(==) + BANG(!)

Parser / Execution tests (8)

Test	Expression	Description
executeLogicalAndNotWithSpaces	a && !b	Baseline with spaces
executeLogicalAndNotWithoutSpaces	a&&!b	Core regression case
executeIfNotNullAndNotWithNoSpaces	if(x!=null&&!y)	Mixed operators in if
executeNestedAndNotWithoutSpaces	a&&!b&&!c	Chained AND-NOT
executeComplexNotNullAndNotEqualsWithoutSpaces	oldObj!=null&&!oldObj.equals("test")	Complex expression
executeComplexNotNullShortCircuitWhenNull	same, with null oldObj	Short-circuit verification
executeLogicalOrNotWithoutSpaces	a||!b	OR-NOT variant
executeOriginalIssuePattern	Full original pattern from #439	End-to-end regression

Test Results

Issue439RegressionTest: 11 tests run, 0 failures, 0 errors
Full suite: 215 tests run, 0 failures, 0 errors, BUILD SUCCESS

Fixes #439

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