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rulego-team
87 lines
3.1 KiB
Go
87 lines
3.1 KiB
Go
/*
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* Copyright 2025 The RuleGo Authors.
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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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*/
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// Package types 定义了StreamSQL系统中使用的核心数据类型和配置结构。
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// 包含投影配置、窗口配置、字段表达式等SQL处理过程中的关键类型定义。
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package types
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import (
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"time"
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"github.com/rulego/streamsql/aggregator"
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)
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// ProjectionSourceType defines the source of a projected field's value.
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type ProjectionSourceType int
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const (
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SourceGroupKey ProjectionSourceType = iota
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SourceAggregateResult
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SourceWindowProperty // For window_start, window_end
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)
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// Projection indicates one item in the SELECT list.
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type Projection struct {
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OutputName string // Final name in the result map (e.g., alias or derived name)
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SourceType ProjectionSourceType // What kind of value is this?
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// InputName refers to:
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// - the name of the group key field, if SourceType is SourceGroupKey.
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// - the key for the aggregate in the SelectFields map (usually the field being aggregated, e.g., "temperature" for AVG(temperature)), if SourceType is SourceAggregateResult.
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// - the property name ("window_start", "window_end"), if SourceType is SourceWindowProperty.
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InputName string
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}
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// FieldExpression 存储字段表达式信息
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type FieldExpression struct {
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// Field 原始字段名
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Field string
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// Expression 完整表达式
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Expression string
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// Fields 表达式中引用的所有字段
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Fields []string
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}
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type Config struct {
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WindowConfig WindowConfig
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GroupFields []string
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// SelectFields: key is the field to aggregate (e.g., "temperature", or "window_start"), value is AggregateType
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SelectFields map[string]aggregator.AggregateType
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// FieldAlias: key is the original field name used in an aggregation (e.g. "temperature" for sum(temperature)), value is the desired output alias (e.g. "sum_temp")
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// For window_start(), key could be "window_start", value could be "start_time".
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FieldAlias map[string]string
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Distinct bool
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// Projections: Defines the fields to be included in the final output and their sources.
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Projections []Projection
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// Limit: 限制结果集的大小，0表示不限制
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Limit int
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// 是否需要窗口处理
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NeedWindow bool
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// 非聚合查询的字段列表
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SimpleFields []string
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// Having: HAVING子句，用于过滤聚合结果
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Having string
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// FieldExpressions: 字段表达式映射，key是字段名，value是表达式信息
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FieldExpressions map[string]FieldExpression
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}
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type WindowConfig struct {
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Type string
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Params map[string]interface{}
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TsProp string
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TimeUnit time.Duration
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GroupByKey string // 会话窗口分组键
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}
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