Examples of com.facebook.presto.sql.tree.StringLiteral

com.facebook.presto.sql.tree.StringLiteral

    {
        List<Partition> partitions = splitManager.getPartitions(tableHandle, Optional.<Map<ColumnHandle, Object>>of(ImmutableMap.<ColumnHandle, Object>of(dsColumnHandle, "foo")));
        assertEquals(partitions.size(), 2);


        // ds=3. No partition will match this.
        Expression nonMatching = new ComparisonExpression(Type.EQUAL, new QualifiedNameReference(new QualifiedName("ds")), new StringLiteral("3"));
        DataSource dataSource = splitManager.getSplits(session, tableHandle, BooleanLiteral.TRUE_LITERAL, nonMatching, Predicates.<Partition>alwaysTrue(), symbols);
        List<Split> splits = ImmutableList.copyOf(dataSource.getSplits());
        // no splits found
        assertEquals(splits.size(), 0);
    }

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    {
        List<Partition> partitions = splitManager.getPartitions(tableHandle, Optional.<Map<ColumnHandle, Object>>of(ImmutableMap.<ColumnHandle, Object>of(dsColumnHandle, "1")));
        assertEquals(partitions.size(), 2);


        // ds=1. One partition with three splits will match this.
        Expression nonMatching = new ComparisonExpression(Type.EQUAL, new QualifiedNameReference(new QualifiedName("ds")), new StringLiteral("1"));
        DataSource dataSource = splitManager.getSplits(session, tableHandle, BooleanLiteral.TRUE_LITERAL, nonMatching, Predicates.<Partition>alwaysTrue(), symbols);
        List<Split> splits = ImmutableList.copyOf(dataSource.getSplits());
        // three splits found
        assertEquals(splits.size(), 3);
    }

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    {
        List<Partition> partitions = splitManager.getPartitions(tableHandle, Optional.<Map<ColumnHandle, Object>>of(ImmutableMap.<ColumnHandle, Object>of(dsColumnHandle, "foo")));
        assertEquals(partitions.size(), 2);


        // foo=bar. Not a prunable column
        Expression nonMatching = new ComparisonExpression(Type.EQUAL, new QualifiedNameReference(new QualifiedName("foo")), new StringLiteral("bar"));
        DataSource dataSource = splitManager.getSplits(session, tableHandle, BooleanLiteral.TRUE_LITERAL, nonMatching, Predicates.<Partition>alwaysTrue(), symbols);
        List<Split> splits = ImmutableList.copyOf(dataSource.getSplits());
        // all splits found
        assertEquals(splits.size(), 4);
    }

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        return new DoubleLiteral(Double.toString(value));
    }


    private static StringLiteral stringLiteral(String value)
    {
        return new StringLiteral(value);
    }

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    private static void assertLike(byte[] value, String pattern, boolean expected)
    {
        Expression predicate = new LikePredicate(
                rawStringLiteral(Slices.wrappedBuffer(value)),
                new StringLiteral(pattern),
                null);
        assertEquals(evaluate(predicate), expected);
    }

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        assertEquals(evaluate(predicate), expected);
    }


    private static StringLiteral rawStringLiteral(final Slice slice)
    {
        return new StringLiteral(slice.toString(UTF_8))
        {
            @Override
            public Slice getSlice()
            {
                return slice;

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        private Regex getConstantPattern(LikePredicate node)
        {
            Regex result = likePatternCache.get(node);


            if (result == null) {
                StringLiteral pattern = (StringLiteral) node.getPattern();
                StringLiteral escape = (StringLiteral) node.getEscape();


                result = LikeUtils.likeToPattern(pattern.getSlice(), escape == null ? null : escape.getSlice());


                likePatternCache.put(node, result);
            }


            return result;

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            schemaName = schema.getSuffix();
        }


        // TODO: throw SemanticException if schema does not exist


        Expression predicate = equal(nameReference("table_schema"), new StringLiteral(schemaName));


        String likePattern = showTables.getLikePattern();
        if (likePattern != null) {
            Expression likePredicate = new LikePredicate(nameReference("table_name"), new StringLiteral(likePattern), null);
            predicate = logicalAnd(predicate, likePredicate);
        }


        Query query = new Query(
                Optional.<With>absent(),

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                                aliasedName("data_type", "Type"),
                                aliasedYesNoToBoolean("is_nullable", "Null"),
                                aliasedYesNoToBoolean("is_partition_key", "Partition Key")),
                        table(QualifiedName.of(tableName.getCatalogName(), TABLE_COLUMNS.getSchemaName(), TABLE_COLUMNS.getTableName())),
                        Optional.of(logicalAnd(
                                equal(nameReference("table_schema"), new StringLiteral(tableName.getSchemaName())),
                                equal(nameReference("table_name"), new StringLiteral(tableName.getTableName())))),
                        ImmutableList.<Expression>of(),
                        Optional.<Expression>absent(),
                        ImmutableList.of(ascending("ordinal_position")),
                        Optional.<String>absent()
                ),

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    }


    private static SelectItem aliasedYesNoToBoolean(String column, String alias)
    {
        Expression expression = new IfExpression(
                equal(nameReference(column), new StringLiteral("YES")),
                BooleanLiteral.TRUE_LITERAL,
                BooleanLiteral.FALSE_LITERAL);
        return new SingleColumn(expression, alias);
    }

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