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https://github.com/GreptimeTeam/greptimedb.git
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46fa3eb629
* chore: upgrade rust toolchain to latest nightly * rebase develop * update rust toolchain in ci
104 lines
3.1 KiB
Rust
104 lines
3.1 KiB
Rust
// Copyright 2023 Greptime Team
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use common_time::range::TimestampRange;
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use common_time::timestamp::TimeUnit;
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use common_time::Timestamp;
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use datafusion_common::{Column, ScalarValue};
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pub use datafusion_expr::expr::Expr as DfExpr;
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use datafusion_expr::{and, binary_expr, Operator};
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/// Central struct of query API.
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/// Represent logical expressions such as `A + 1`, or `CAST(c1 AS int)`.
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#[derive(Clone, PartialEq, Eq, Hash, Debug)]
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pub struct Expr {
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df_expr: DfExpr,
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}
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impl Expr {
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pub fn df_expr(&self) -> &DfExpr {
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&self.df_expr
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}
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}
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impl From<DfExpr> for Expr {
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fn from(df_expr: DfExpr) -> Self {
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Self { df_expr }
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}
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}
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/// Builds an `Expr` that filters timestamp column from given timestamp range.
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/// Returns [None] if time range is [None] or full time range.
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pub fn build_filter_from_timestamp(
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ts_col_name: &str,
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time_range: Option<&TimestampRange>,
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) -> Option<Expr> {
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let Some(time_range) = time_range else {
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return None;
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};
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let ts_col_expr = DfExpr::Column(Column {
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relation: None,
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name: ts_col_name.to_string(),
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});
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let df_expr = match (time_range.start(), time_range.end()) {
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(None, None) => None,
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(Some(start), None) => Some(binary_expr(
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ts_col_expr,
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Operator::GtEq,
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timestamp_to_literal(start),
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)),
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(None, Some(end)) => Some(binary_expr(
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ts_col_expr,
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Operator::Lt,
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timestamp_to_literal(end),
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)),
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(Some(start), Some(end)) => Some(and(
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binary_expr(
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ts_col_expr.clone(),
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Operator::GtEq,
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timestamp_to_literal(start),
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),
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binary_expr(ts_col_expr, Operator::Lt, timestamp_to_literal(end)),
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)),
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};
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df_expr.map(Expr::from)
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}
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/// Converts a [Timestamp] to datafusion literal value.
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fn timestamp_to_literal(timestamp: &Timestamp) -> DfExpr {
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let scalar_value = match timestamp.unit() {
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TimeUnit::Second => ScalarValue::TimestampSecond(Some(timestamp.value()), None),
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TimeUnit::Millisecond => ScalarValue::TimestampMillisecond(Some(timestamp.value()), None),
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TimeUnit::Microsecond => ScalarValue::TimestampMicrosecond(Some(timestamp.value()), None),
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TimeUnit::Nanosecond => ScalarValue::TimestampNanosecond(Some(timestamp.value()), None),
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};
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DfExpr::Literal(scalar_value)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_from_df_expr() {
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let df_expr = DfExpr::Wildcard;
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let expr: Expr = df_expr.into();
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assert_eq!(DfExpr::Wildcard, *expr.df_expr());
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}
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}
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