Exemple #1
0
    def is_foreign_expr(self, expr):
        from ibis.expr.analysis import ExprValidator

        # The expression isn't foreign to us. For example, the parent table set
        # in a correlated WHERE subquery
        if self.has_ref(expr, parent_contexts=True):
            return False

        exprs = [self.query.table_set] + self.query.select_set
        validator = ExprValidator(exprs)
        return not validator.validate(expr)
Exemple #2
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    def __init__(self, table_expr, proj_exprs):
        from ibis.expr.analysis import ExprValidator

        # Need to validate that the column expressions are compatible with the
        # input table; this means they must either be scalar expressions or
        # array expressions originating from the same root table expression
        validator = ExprValidator([table_expr])

        # Resolve schema and initialize
        types = []
        names = []
        clean_exprs = []
        for expr in proj_exprs:
            if isinstance(expr, py_string):
                expr = table_expr[expr]

            validator.assert_valid(expr)
            if isinstance(expr, ValueExpr):
                name = expr.get_name()
                names.append(name)
                types.append(expr.type())
            elif rules.is_table(expr):
                schema = expr.schema()
                names.extend(schema.names)
                types.extend(schema.types)
            else:
                raise NotImplementedError

            clean_exprs.append(expr)

        # validate uniqueness
        schema = ir.Schema(names, types)

        HasSchema.__init__(self, schema)
        Node.__init__(self, [table_expr] + [clean_exprs])

        self.table = table_expr
        self.selections = clean_exprs
Exemple #3
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    def __init__(self, left, right, join_predicates):
        from ibis.expr.analysis import ExprValidator

        if not rules.is_table(left):
            raise TypeError('Can only join table expressions, got %s for '
                            'left table' % type(left))

        if not rules.is_table(right):
            raise TypeError('Can only join table expressions, got %s for '
                            'right table' % type(left))

        if left.equals(right):
            right = right.view()

        self.left = left
        self.right = right
        self.predicates = self._clean_predicates(join_predicates)

        # Validate join predicates. Each predicate must be valid jointly when
        # considering the roots of each input table
        validator = ExprValidator([self.left, self.right])
        validator.validate_all(self.predicates)

        Node.__init__(self, [self.left, self.right, self.predicates])
Exemple #4
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    def _assert_valid(self, exprs):
        from ibis.expr.analysis import ExprValidator

        ExprValidator([self]).validate_all(exprs)