python-bigquery-dataframes/bigframes/core/compile/sqlglot/expressions/datetime_ops.py at 6a3a1c328315214a0f20549dcb57dbdab49d2532 · googleapis/python-bigquery-dataframes · GitHub

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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 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

register_unary_op = scalar_compiler.scalar_op_compiler.register_unary_op


@register_unary_op(ops.FloorDtOp, pass_op=True)
def _(expr: TypedExpr, op: ops.FloorDtOp) -> sge.Expression:
    # TODO: Remove this method when it is covered by ops.FloorOp
    return sge.TimestampTrunc(this=expr.expr, unit=sge.Identifier(this=op.freq))


@register_unary_op(ops.hour_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="HOUR"), expression=expr.expr)


@register_unary_op(ops.minute_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="MINUTE"), expression=expr.expr)


@register_unary_op(ops.month_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="MONTH"), expression=expr.expr)


@register_unary_op(ops.normalize_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.TimestampTrunc(this=expr.expr, unit=sge.Identifier(this="DAY"))


@register_unary_op(ops.quarter_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="QUARTER"), expression=expr.expr)


@register_unary_op(ops.second_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="SECOND"), expression=expr.expr)


@register_unary_op(ops.StrftimeOp, pass_op=True)
def _(expr: TypedExpr, op: ops.StrftimeOp) -> sge.Expression:
    return sge.func("FORMAT_TIMESTAMP", sge.convert(op.date_format), expr.expr)


@register_unary_op(ops.time_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.func("TIME", expr.expr)


@register_unary_op(ops.ToDatetimeOp)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Cast(this=sge.func("TIMESTAMP_SECONDS", expr.expr), to="DATETIME")


@register_unary_op(ops.ToTimestampOp)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.func("TIMESTAMP_SECONDS", expr.expr)


@register_unary_op(ops.UnixMicros)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.func("UNIX_MICROS", expr.expr)


@register_unary_op(ops.UnixMillis)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.func("UNIX_MILLIS", expr.expr)


@register_unary_op(ops.UnixSeconds, pass_op=True)
def _(expr: TypedExpr, op: ops.UnixSeconds) -> sge.Expression:
    return sge.func("UNIX_SECONDS", expr.expr)


@register_unary_op(ops.year_op)
def _(expr: TypedExpr) -> sge.Expression:
    return sge.Extract(this=sge.Identifier(this="YEAR"), expression=expr.expr)