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numeric_ops.py
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677 lines (561 loc) · 21.1 KB
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# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import annotations
import bigframes_vendored.constants as bf_constants
import bigframes_vendored.sqlglot.expressions as sge
from bigframes import dtypes
from bigframes import operations as ops
from bigframes.core.compile.sqlglot import sql
import bigframes.core.compile.sqlglot.expression_compiler as expression_compiler
from bigframes.core.compile.sqlglot.expressions.common import round_towards_zero
import bigframes.core.compile.sqlglot.expressions.constants as constants
from bigframes.core.compile.sqlglot.expressions.typed_expr import TypedExpr
from bigframes.operations import numeric_ops
register_unary_op = expression_compiler.expression_compiler.register_unary_op
register_binary_op = expression_compiler.expression_compiler.register_binary_op
@register_unary_op(ops.abs_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Abs(this=expr.expr)
@register_unary_op(ops.arccosh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=expr.expr < sge.convert(1),
true=constants._NAN,
)
],
default=sge.func("ACOSH", expr.expr),
)
@register_unary_op(ops.arccos_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.func("ABS", expr.expr) > sge.convert(1),
true=constants._NAN,
)
],
default=sge.func("ACOS", expr.expr),
)
@register_unary_op(ops.arcsin_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.func("ABS", expr.expr) > sge.convert(1),
true=constants._NAN,
)
],
default=sge.func("ASIN", expr.expr),
)
@register_unary_op(ops.arcsinh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("ASINH", expr.expr)
@register_binary_op(ops.arctan2_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
return sge.func("ATAN2", left_expr, right_expr)
@register_unary_op(ops.arctan_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("ATAN", expr.expr)
@register_unary_op(ops.arctanh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
# |x| < 1: The standard formula
sge.If(
this=sge.func("ABS", expr.expr) < sge.convert(1),
true=sge.func("ATANH", expr.expr),
),
# |x| > 1: Returns NaN
sge.If(
this=sge.func("ABS", expr.expr) > sge.convert(1),
true=constants._NAN,
),
],
# |x| = 1: Returns Infinity or -Infinity
default=sge.Mul(this=constants._INF, expression=expr.expr),
)
@register_unary_op(ops.ceil_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Ceil(this=expr.expr)
@register_unary_op(ops.cos_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("COS", expr.expr)
@register_unary_op(ops.cosh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.func("ABS", expr.expr) > sge.convert(709.78),
true=constants._INF,
)
],
default=sge.func("COSH", expr.expr),
)
@register_binary_op(ops.cosine_distance_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
return sge.func("ML.DISTANCE", left.expr, right.expr, sge.Literal.string("COSINE"))
@register_unary_op(ops.exp_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=expr.expr > constants._FLOAT64_EXP_BOUND,
true=constants._INF,
)
],
default=sge.func("EXP", expr.expr),
)
@register_unary_op(ops.expm1_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.If(
this=expr.expr > constants._FLOAT64_EXP_BOUND,
true=constants._INF,
false=sge.func("EXP", expr.expr) - sge.convert(1),
)
@register_unary_op(ops.floor_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Floor(this=expr.expr)
@register_unary_op(ops.ln_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.Is(this=expr.expr, expression=sge.Null()),
true=sge.null(),
),
# |x| > 0: The standard formula
sge.If(
this=expr.expr > sge.convert(0),
true=sge.Ln(this=expr.expr),
),
# |x| < 0: Returns NaN
sge.If(
this=expr.expr < sge.convert(0),
true=constants._NAN,
),
],
# |x| == 0: Returns -Infinity
default=constants._NEG_INF,
)
@register_unary_op(ops.log10_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.Is(this=expr.expr, expression=sge.Null()),
true=sge.null(),
),
# |x| > 0: The standard formula
sge.If(
this=expr.expr > sge.convert(0),
true=sge.Log(this=sge.convert(10), expression=expr.expr),
),
# |x| < 0: Returns NaN
sge.If(
this=expr.expr < sge.convert(0),
true=constants._NAN,
),
],
# |x| == 0: Returns -Infinity
default=constants._NEG_INF,
)
@register_unary_op(ops.log1p_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.Is(this=expr.expr, expression=sge.Null()),
true=sge.null(),
),
# Domain: |x| > -1 (The standard formula)
sge.If(
this=expr.expr > sge.convert(-1),
true=sge.Ln(this=sge.convert(1) + expr.expr),
),
# Out of Domain: |x| < -1 (Returns NaN)
sge.If(
this=expr.expr < sge.convert(-1),
true=constants._NAN,
),
],
# Boundary: |x| == -1 (Returns -Infinity)
default=constants._NEG_INF,
)
@register_unary_op(ops.neg_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Neg(this=sge.paren(expr.expr))
@register_unary_op(ops.pos_op)
def _(expr: TypedExpr) -> sge.Expression:
return expr.expr
@register_binary_op(ops.pow_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
if left.dtype == dtypes.INT_DTYPE and right.dtype == dtypes.INT_DTYPE:
return _int_pow_op(left_expr, right_expr)
else:
return _float_pow_op(left_expr, right_expr)
def _int_pow_op(
left_expr: sge.Expression, right_expr: sge.Expression
) -> sge.Expression:
if sql.is_null_literal(left_expr) or sql.is_null_literal(right_expr):
return sge.null()
overflow_cond = sge.and_(
sge.NEQ(this=left_expr, expression=sge.convert(0)),
sge.GT(
this=sge.Mul(
this=right_expr, expression=sge.Ln(this=sge.Abs(this=left_expr))
),
expression=sge.convert(constants._INT64_LOG_BOUND),
),
)
return sge.Case(
ifs=[
sge.If(
this=overflow_cond,
true=sge.Null(),
)
],
default=sge.Cast(
this=sge.Pow(
this=sge.Cast(
this=left_expr, to=sge.DataType(this=sge.DataType.Type.DECIMAL)
),
expression=right_expr,
),
to="INT64",
),
)
def _float_pow_op(
left_expr: sge.Expression, right_expr: sge.Expression
) -> sge.Expression:
if sql.is_null_literal(left_expr) or sql.is_null_literal(right_expr):
return sge.null()
# Most conditions here seek to prevent calling BQ POW with inputs that would generate errors.
# See: https://cloud.google.com/bigquery/docs/reference/standard-sql/mathematical_functions#pow
overflow_cond = sge.and_(
sge.NEQ(this=left_expr, expression=constants._ZERO),
sge.GT(
this=sge.Mul(
this=right_expr, expression=sge.Ln(this=sge.Abs(this=left_expr))
),
expression=constants._FLOAT64_EXP_BOUND,
),
)
# Float64 lose integer precision beyond 2**53, beyond this insufficient precision to get parity
exp_too_big = sge.GT(
this=sge.Abs(this=right_expr),
expression=sge.convert(constants._FLOAT64_MAX_INT_PRECISION),
)
# Treat very large exponents as +=INF
norm_exp = sge.Case(
ifs=[
sge.If(
this=exp_too_big,
true=sge.Mul(this=constants._INF, expression=sge.Sign(this=right_expr)),
)
],
default=right_expr,
)
pow_result = sge.Pow(this=left_expr, expression=norm_exp)
# This cast is dangerous, need to only excuted where y_val has been bounds-checked
# Ibis needs try_cast binding to bq safe_cast
exponent_is_whole = sge.EQ(
this=sge.Cast(this=right_expr, to="INT64"), expression=right_expr
)
odd_exponent = sge.and_(
sge.LT(this=left_expr, expression=constants._ZERO),
sge.EQ(
this=sge.Mod(
this=sge.Cast(this=right_expr, to="INT64"), expression=sge.convert(2)
),
expression=sge.convert(1),
),
)
infinite_base = sge.EQ(this=sge.Abs(this=left_expr), expression=constants._INF)
return sge.Case(
ifs=[
# Might be able to do something more clever with x_val==0 case
sge.If(
this=sge.EQ(this=right_expr, expression=constants._ZERO),
true=sge.convert(1),
),
sge.If(
this=sge.EQ(this=left_expr, expression=sge.convert(1)),
true=sge.convert(1),
), # Need to ignore exponent, even if it is NA
sge.If(
this=sge.and_(
sge.EQ(this=left_expr, expression=constants._ZERO),
sge.LT(this=right_expr, expression=constants._ZERO),
),
true=constants._INF,
), # This case would error POW function in BQ
sge.If(this=infinite_base, true=pow_result),
sge.If(
this=exp_too_big, true=pow_result
), # Bigquery can actually handle the +-inf cases gracefully
sge.If(
this=sge.and_(
sge.LT(this=left_expr, expression=constants._ZERO),
sge.Not(this=sge.paren(exponent_is_whole)),
),
true=constants._NAN,
),
sge.If(
this=overflow_cond,
true=sge.Mul(
this=constants._INF,
expression=sge.Case(
ifs=[sge.If(this=odd_exponent, true=sge.convert(-1))],
default=sge.convert(1),
),
),
), # finite overflows would cause bq to error
],
default=pow_result,
)
@register_unary_op(ops.sqrt_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=expr.expr < sge.convert(0),
true=constants._NAN,
)
],
default=sge.Sqrt(this=expr.expr),
)
@register_unary_op(ops.sin_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("SIN", expr.expr)
@register_unary_op(ops.sinh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.Case(
ifs=[
sge.If(
this=sge.func("ABS", expr.expr) > constants._FLOAT64_EXP_BOUND,
true=sge.func("SIGN", expr.expr) * constants._INF,
)
],
default=sge.func("SINH", expr.expr),
)
@register_unary_op(ops.tan_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("TAN", expr.expr)
@register_unary_op(ops.tanh_op)
def _(expr: TypedExpr) -> sge.Expression:
return sge.func("TANH", expr.expr)
@register_binary_op(ops.add_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
if left.dtype == dtypes.STRING_DTYPE and right.dtype == dtypes.STRING_DTYPE:
# String addition
return sge.Concat(expressions=[left.expr, right.expr])
if dtypes.is_numeric(left.dtype) and dtypes.is_numeric(right.dtype):
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
return sge.Add(this=left_expr, expression=right_expr)
if (
dtypes.is_time_or_date_like(left.dtype)
and right.dtype == dtypes.TIMEDELTA_DTYPE
):
left_expr = _coerce_date_to_datetime(left)
return sge.TimestampAdd(
this=left_expr, expression=right.expr, unit=sge.Var(this="MICROSECOND")
)
if (
dtypes.is_time_or_date_like(right.dtype)
and left.dtype == dtypes.TIMEDELTA_DTYPE
):
right_expr = _coerce_date_to_datetime(right)
return sge.TimestampAdd(
this=right_expr, expression=left.expr, unit=sge.Var(this="MICROSECOND")
)
if left.dtype == dtypes.TIMEDELTA_DTYPE and right.dtype == dtypes.TIMEDELTA_DTYPE:
return sge.Add(this=left.expr, expression=right.expr)
raise TypeError(
f"Cannot add type {left.dtype} and {right.dtype}. {bf_constants.FEEDBACK_LINK}"
)
@register_binary_op(ops.div_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
result = sge.func("IEEE_DIVIDE", left_expr, right_expr)
if left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype):
return round_towards_zero(result)
else:
return result
@register_binary_op(ops.euclidean_distance_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
return sge.func(
"ML.DISTANCE", left.expr, right.expr, sge.Literal.string("EUCLIDEAN")
)
@register_binary_op(ops.floordiv_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
result: sge.Expression = sge.Cast(
this=sge.Floor(this=sge.func("IEEE_DIVIDE", left_expr, right_expr)), to="INT64"
)
# DIV(N, 0) will error in bigquery, but needs to return `0` for int, and
# `inf`` for float in BQ so we short-circuit in this case.
# Multiplying left by zero propogates nulls.
zero_result = (
constants._INF
if (left.dtype == dtypes.FLOAT_DTYPE or right.dtype == dtypes.FLOAT_DTYPE)
else constants._ZERO
)
result = sge.Case(
ifs=[
sge.If(
this=sge.EQ(this=right_expr, expression=constants._ZERO),
true=zero_result * left_expr,
)
],
default=result,
)
if dtypes.is_numeric(right.dtype) and left.dtype == dtypes.TIMEDELTA_DTYPE:
result = round_towards_zero(sge.func("IEEE_DIVIDE", left_expr, right_expr))
return result
@register_binary_op(ops.manhattan_distance_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
return sge.func(
"ML.DISTANCE", left.expr, right.expr, sge.Literal.string("MANHATTAN")
)
@register_binary_op(ops.mod_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
# In BigQuery returned value has the same sign as X. In pandas, the sign of y is used, so we need to flip the result if sign(x) != sign(y)
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
# BigQuery MOD function doesn't support float types, so cast to BIGNUMERIC
if left.dtype == dtypes.FLOAT_DTYPE or right.dtype == dtypes.FLOAT_DTYPE:
left_expr = sge.Cast(this=left_expr, to="BIGNUMERIC")
right_expr = sge.Cast(this=right_expr, to="BIGNUMERIC")
# MOD(N, 0) will error in bigquery, but needs to return null
bq_mod = sge.Mod(this=left_expr, expression=right_expr)
zero_result = (
constants._NAN
if (left.dtype == dtypes.FLOAT_DTYPE or right.dtype == dtypes.FLOAT_DTYPE)
else constants._ZERO
)
return sge.Case(
ifs=[
sge.If(
this=sge.EQ(this=right_expr, expression=constants._ZERO),
true=zero_result * left_expr,
),
sge.If(
this=sge.and_(
right_expr < constants._ZERO,
bq_mod > constants._ZERO,
),
true=right_expr + bq_mod,
),
sge.If(
this=sge.and_(
right_expr > constants._ZERO,
bq_mod < constants._ZERO,
),
true=right_expr + bq_mod,
),
],
default=bq_mod,
)
@register_binary_op(ops.mul_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
result = sge.Mul(this=left_expr, expression=right_expr)
if (dtypes.is_numeric(left.dtype) and right.dtype == dtypes.TIMEDELTA_DTYPE) or (
left.dtype == dtypes.TIMEDELTA_DTYPE and dtypes.is_numeric(right.dtype)
):
return round_towards_zero(result)
else:
return result
@register_binary_op(ops.round_op)
def _(expr: TypedExpr, n_digits: TypedExpr) -> sge.Expression:
rounded = sge.Round(this=expr.expr, decimals=n_digits.expr)
if expr.dtype == dtypes.INT_DTYPE:
return sge.Cast(this=rounded, to="INT64")
return rounded
@register_binary_op(ops.sub_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
if sql.is_null_literal(left.expr) or sql.is_null_literal(right.expr):
return sge.null()
if dtypes.is_numeric(left.dtype) and dtypes.is_numeric(right.dtype):
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
return sge.Sub(this=left_expr, expression=right_expr)
if (
dtypes.is_time_or_date_like(left.dtype)
and right.dtype == dtypes.TIMEDELTA_DTYPE
):
left_expr = _coerce_date_to_datetime(left)
return sge.TimestampSub(
this=left_expr, expression=right.expr, unit=sge.Var(this="MICROSECOND")
)
if dtypes.is_time_or_date_like(left.dtype) and dtypes.is_time_or_date_like(
right.dtype
):
left_expr = _coerce_date_to_datetime(left)
right_expr = _coerce_date_to_datetime(right)
return sge.TimestampDiff(
this=left_expr, expression=right_expr, unit=sge.Var(this="MICROSECOND")
)
if left.dtype == dtypes.TIMEDELTA_DTYPE and right.dtype == dtypes.TIMEDELTA_DTYPE:
return sge.Sub(this=left.expr, expression=right.expr)
raise TypeError(
f"Cannot subtract type {left.dtype} and {right.dtype}. {bf_constants.FEEDBACK_LINK}"
)
@register_binary_op(ops.unsafe_pow_op)
def _(left: TypedExpr, right: TypedExpr) -> sge.Expression:
"""For internal use only - where domain and overflow checks are not needed."""
left_expr = _coerce_bool_to_int(left)
right_expr = _coerce_bool_to_int(right)
return sge.Pow(this=left_expr, expression=right_expr)
@register_unary_op(numeric_ops.isnan_op)
def isnan(arg: TypedExpr) -> sge.Expression:
return sge.IsNan(this=arg.expr)
@register_unary_op(numeric_ops.isfinite_op)
def isfinite(arg: TypedExpr) -> sge.Expression:
return sge.Not(
this=sge.Or(
this=sge.IsInf(this=arg.expr),
expression=sge.IsNan(this=arg.expr),
),
)
def _coerce_bool_to_int(typed_expr: TypedExpr) -> sge.Expression:
"""Coerce boolean expression to integer."""
if typed_expr.dtype == dtypes.BOOL_DTYPE:
return sge.Cast(this=typed_expr.expr, to="INT64")
return typed_expr.expr
def _coerce_date_to_datetime(typed_expr: TypedExpr) -> sge.Expression:
"""Coerce date expression to datetime."""
if typed_expr.dtype == dtypes.DATE_DTYPE:
return sge.Cast(this=typed_expr.expr, to="DATETIME")
return typed_expr.expr