def test_column_ref_table_aliases():
context = ImpalaCompiler.make_context()
table1 = ibis.table([('key1', 'string'), ('value1', 'double')])
table2 = ibis.table([('key2', 'string'), ('value and2', 'double')])
context.set_ref(table1, 't0')
context.set_ref(table2, 't1')
expr = table1['value1'] - table2['value and2']
result = translate(expr, context=context)
expected = 't0.`value1` - t1.`value and2`'
assert result == expected
def test_correlated_predicate_subquery(table):
t0 = table
t1 = t0.view()
expr = t0.g == t1.g
ctx = ImpalaCompiler.make_context()
ctx.make_alias(t0)
# Grab alias from parent context
subctx = ctx.subcontext()
subctx.make_alias(t1)
subctx.make_alias(t0)
result = translate(expr, context=subctx)
expected = "t0.`g` = t1.`g`"
assert result == expected
def translate(expr, context=None, named=False):
if context is None:
context = ImpalaCompiler.make_context()
translator = ImpalaExprTranslator(expr, context=context, named=named)
return translator.get_result()
