expressions. Change Expr.zToken to Expr.u.zToken and added Expr.u.iValue.
Remove an unnecessary ExprDup from CHECK constraint processing. And so forth. (CVS 6682)
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Expr.token into a char* Expr.zToken. Also simplify the Token object by
removing the Token.dyn and Token.quoted fields. (CVS 6681)
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presentation. New comments added. The EXPRDUP_DISTINCTSPAN flag is
removed as obsolete. (CVS 6470)
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