presto-parser/src/main/java/io/prestosql/sql/parser/AstBuilder.java/AstBuilder/visitSearchedCase
class AstBuilder:    @Override
    public Node visitSearchedCase(SqlBaseParser.SearchedCaseContext context)
    {
        return new SearchedCaseExpression(
                getLocation(context),
                visit(context.whenClause(), WhenClause.class),
                visitIfPresent(context.elseExpression, Expression.class));
    }