like sql "SELECT a, CASE WHEN b > 1 THEN a || 'b' || c WHEN a = 3 THEN 'AAA' else 'a' || 'b' END FROM tab1 ".
CaseWhenExpression（）
<K_ELSE> elseExp=PrimaryExpression() --> <K_ELSE> elseExp=SimpleExpression()
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like sql "SELECT a, CASE WHEN b > 1 THEN a || 'b' || c WHEN a = 3 THEN 'AAA' else 'a' || 'b' END FROM tab1 ".
CaseWhenExpression（）
<K_ELSE> elseExp=PrimaryExpression() --> <K_ELSE> elseExp=SimpleExpression()