def _expand_simmodel_exp(exp, simcols):
if isinstance(exp, ast.ExpCol) or ast.is_bql(exp):
tmpname = 'v%d' % (len(simcols), )
simcols.append(ast.SelColExp(exp, tmpname))
return ast.ExpCol(None, tmpname)
elif isinstance(exp, ast.ExpLit) or \
isinstance(exp, ast.ExpNumpar) or \
isinstance(exp, ast.ExpNampar):
return exp
elif isinstance(exp, ast.ExpSub) or \
isinstance(exp, ast.ExpExists):
# XXX Not really right -- need to provide correct scoping.
return exp # XXX subquery scoping
elif isinstance(exp, ast.ExpCollate):
subexp = _expand_simmodel_exp(exp.expression, simcols)
return ast.ExpCollate(subexp, exp.collation)
elif isinstance(exp, ast.ExpInQuery):
subexp = _expand_simmodel_exp(exp.expression, simcols)
subquery = exp.subquery # XXX subquery scoping
return ast.ExpIn(subexp, exp.positive, subquery)
elif isinstance(exp, ast.ExpInExp):
subexp = _expand_simmodel_exp(exp.expression, simcols)
subexps = [_expand_simmodel_exp(se, simcols) for se in exp.expressions]
return ast.ExpIn(subexp, exp.positive, subexps)
elif isinstance(exp, ast.ExpCast):
subexp = _expand_simmodel_exp(exp.expression, simcols)
return ast.ExpCast(subexp, exp.type)
elif isinstance(exp, ast.ExpApp):
operands = [
_expand_simmodel_exp(operand, simcols) for operand in exp.operands
]
return ast.ExpApp(exp.distinct, exp.operator, operands)
elif isinstance(exp, ast.ExpAppStar):
return exp
elif isinstance(exp, ast.ExpCase):
raise NotImplementedError("I'm too lazy to do CASE right now.")
elif isinstance(exp, ast.ExpOp):
operands = [
_expand_simmodel_exp(operand, simcols) for operand in exp.operands
]
return ast.ExpOp(exp.operator, operands)
else:
assert False, 'Invalid expression: %s' % (repr(exp), )
def p_primary_cast(self, e, t):
return ast.ExpCast(e, t)
def p_primary_cast(self, e, t): return ast.ExpCast(e, t) def p_primary_exists(self, q): return ast.ExpExists(q)