def test_Projection():
t = TableSymbol('t', '{name: string, amount: int, id: int32}')
p = projection(t, ['amount', 'name'])
assert p.schema == dshape('{amount: int32, name: string}')
print(t['amount'].dshape)
print(dshape('var * int32'))
assert t['amount'].dshape == dshape('var * {amount: int32}')
assert eval(str(p)).isidentical(p)
def test_Projection():
t = TableSymbol('t', '{name: string, amount: int, id: int32}')
p = projection(t, ['amount', 'name'])
assert p.schema == dshape('{amount: int32, name: string}')
print(t['amount'].dshape)
print(dshape('var * int32'))
assert t['amount'].dshape == dshape('var * {amount: int32}')
assert eval(str(p)).isidentical(p)
assert p.project(['amount','name']) == p[['amount','name']]
with pytest.raises(ValueError):
p.project('balance')
def test_Projection():
t = symbol('t', 'var * {name: string, amount: int, id: int32}')
p = projection(t, ['amount', 'name'])
assert p.schema == dshape('{amount: int32, name: string}')
print(t['amount'].dshape)
print(dshape('var * int32'))
assert t['amount'].dshape == dshape('var * int32')
assert t['amount']._name == 'amount'
assert eval(str(p)).isidentical(p)
assert p._project(['amount', 'name']) == p[['amount', 'name']]
with pytest.raises(ValueError):
p._project('balance')
def test_Projection():
t = TableSymbol("t", "{name: string, amount: int, id: int32}")
p = projection(t, ["amount", "name"])
assert p.schema == dshape("{amount: int32, name: string}")
print(t["amount"].dshape)
print(dshape("var * int32"))
assert t["amount"].dshape == dshape("var * int32")
assert t["amount"]._name == "amount"
assert eval(str(p)).isidentical(p)
assert p._project(["amount", "name"]) == p[["amount", "name"]]
with pytest.raises(ValueError):
p._project("balance")
def test_indexing():
t = TableSymbol('t', '{name: string, amount: int, id: int}')
assert t[['amount', 'id']] == projection(t, ['amount', 'id'])
assert t['amount'].isidentical(Field(t, 'amount'))
def test_indexing():
t = symbol('t', 'var * {name: string, amount: int, id: int}')
assert t[['amount', 'id']] == projection(t, ['amount', 'id'])
assert t['amount'].isidentical(Field(t, 'amount'))
def test_indexing():
t = TableSymbol("t", "{name: string, amount: int, id: int}")
assert t[["amount", "id"]] == projection(t, ["amount", "id"])
assert t["amount"].isidentical(Field(t, "amount"))
