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array_ops.py
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133 lines (104 loc) · 4.05 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 typing
import sqlglot as sg
import sqlglot.expressions as sge
from bigframes import operations as ops
from bigframes.core.compile.sqlglot.expressions.typed_expr import TypedExpr
import bigframes.core.compile.sqlglot.scalar_compiler as scalar_compiler
import bigframes.dtypes as dtypes
register_unary_op = scalar_compiler.scalar_op_compiler.register_unary_op
register_nary_op = scalar_compiler.scalar_op_compiler.register_nary_op
@register_unary_op(ops.ArrayIndexOp, pass_op=True)
def _(expr: TypedExpr, op: ops.ArrayIndexOp) -> sge.Expression:
if expr.dtype == dtypes.STRING_DTYPE:
return _string_index(expr, op)
return sge.Bracket(
this=expr.expr,
expressions=[sge.convert(op.index)],
safe=True,
offset=False,
)
@register_unary_op(ops.ArrayReduceOp, pass_op=True)
def _(expr: TypedExpr, op: ops.ArrayReduceOp) -> sge.Expression:
sub_expr = sg.to_identifier("bf_arr_reduce_uid")
sub_type = dtypes.get_array_inner_type(expr.dtype)
if op.aggregation.order_independent:
from bigframes.core.compile.sqlglot.aggregations import unary_compiler
agg_expr = unary_compiler.compile(op.aggregation, TypedExpr(sub_expr, sub_type))
else:
from bigframes.core.compile.sqlglot.aggregations import ordered_unary_compiler
agg_expr = ordered_unary_compiler.compile(
op.aggregation, TypedExpr(sub_expr, sub_type)
)
return (
sge.select(agg_expr)
.from_(
sge.Unnest(
expressions=[expr.expr],
alias=sge.TableAlias(columns=[sub_expr]),
)
)
.subquery()
)
@register_unary_op(ops.ArraySliceOp, pass_op=True)
def _(expr: TypedExpr, op: ops.ArraySliceOp) -> sge.Expression:
slice_idx = sg.to_identifier("slice_idx")
conditions: typing.List[sge.Predicate] = [slice_idx >= op.start]
if op.stop is not None:
conditions.append(slice_idx < op.stop)
# local name for each element in the array
el = sg.to_identifier("el")
selected_elements = (
sge.select(el)
.from_(
sge.Unnest(
expressions=[expr.expr],
alias=sge.TableAlias(columns=[el]),
offset=slice_idx,
)
)
.where(*conditions)
)
return sge.array(selected_elements)
@register_unary_op(ops.ArrayToStringOp, pass_op=True)
def _(expr: TypedExpr, op: ops.ArrayToStringOp) -> sge.Expression:
return sge.ArrayToString(this=expr.expr, expression=f"'{op.delimiter}'")
@register_nary_op(ops.ToArrayOp)
def _(*exprs: TypedExpr) -> sge.Expression:
do_upcast_bool = any(
dtypes.is_numeric(expr.dtype, include_bool=False) for expr in exprs
)
if do_upcast_bool:
sg_exprs = [_coerce_bool_to_int(expr) for expr in exprs]
else:
sg_exprs = [expr.expr for expr in exprs]
return sge.Array(expressions=sg_exprs)
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 _string_index(expr: TypedExpr, op: ops.ArrayIndexOp) -> sge.Expression:
sub_str = sge.Substring(
this=expr.expr,
start=sge.convert(op.index + 1),
length=sge.convert(1),
)
return sge.If(
this=sge.NEQ(this=sub_str, expression=sge.convert("")),
true=sub_str,
false=sge.Null(),
)