Examples of org.teiid.query.sql.lang.FromClause

org.teiid.query.sql.lang.FromClause
A FromClause is an interface for subparts held in a FROM clause. One type of FromClause is {@link UnaryFromClause}, which is the more common use and represents a single group. Another, less common type of FromClause is the {@link JoinPredicate} which represents a join between two FromClausesand may contain criteria.

        if (obj.hasHint()) {
            append("(");//$NON-NLS-1$
        }


        // left clause
        FromClause leftClause = obj.getLeftClause();
        if (leftClause instanceof JoinPredicate && !((JoinPredicate)leftClause).hasHint()) {
            append("("); //$NON-NLS-1$
            visitNode(leftClause);
            append(")"); //$NON-NLS-1$
        } else {
            visitNode(leftClause);
        }


        // join type
        append(SPACE);
        visitNode(obj.getJoinType());
        append(SPACE);


        // right clause
        FromClause rightClause = obj.getRightClause();
        if (rightClause instanceof JoinPredicate && !((JoinPredicate)rightClause).hasHint()) {
            append("("); //$NON-NLS-1$
            visitNode(rightClause);
            append(")"); //$NON-NLS-1$
        } else {

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        if (from.getClauses().size() != 1) {
            return false;
        }
        
        FromClause clause = from.getClauses().get(0);
        
        if (!(clause instanceof UnaryFromClause)) {
            return false;
        }

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  public static JoinPredicate example(JoinType joinType, String joinOnElement) {
    JoinPredicate jp = new JoinPredicate();


    GroupSymbol g1 = new GroupSymbol("m.g1"); //$NON-NLS-1$
    GroupSymbol g2 = new GroupSymbol("m.g2"); //$NON-NLS-1$
    FromClause lc = new UnaryFromClause(g1);
    FromClause rc = new UnaryFromClause(g2);


    Expression le = new ElementSymbol("m.g1." + joinOnElement); //$NON-NLS-1$
    Expression re = new ElementSymbol("m.g2." + joinOnElement); //$NON-NLS-1$
    Criteria c1 = new CompareCriteria(le, CompareCriteria.EQ, re);

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