1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

use std::any::Any;
use std::collections::HashMap;

use crate::expression::Expression;

pub enum StatementKind {
    Select,
    Where,
    Having,
    Limit,
    Offset,
    OrderBy,
    GroupBy,
    AggregateFunction,
}

pub trait Statement {
    fn get_statement_kind(&self) -> StatementKind;
    fn as_any(&self) -> &dyn Any;
}

pub struct GQLQuery {
    pub statements: HashMap<String, Box<dyn Statement>>,
    pub has_aggregation_function: bool,
    pub hidden_selections: Vec<String>,
}

pub struct SelectStatement {
    pub table_name: String,
    pub fields_names: Vec<String>,
    pub fields_values: Vec<Box<dyn Expression>>,
    pub alias_table: HashMap<String, String>,
}

impl Statement for SelectStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::Select
    }
}

pub struct WhereStatement {
    pub condition: Box<dyn Expression>,
}

impl Statement for WhereStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::Where
    }
}

pub struct HavingStatement {
    pub condition: Box<dyn Expression>,
}

impl Statement for HavingStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::Having
    }
}

pub struct LimitStatement {
    pub count: usize,
}

impl Statement for LimitStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::Limit
    }
}

pub struct OffsetStatement {
    pub count: usize,
}

impl Statement for OffsetStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::Offset
    }
}

pub struct OrderByStatement {
    pub expression: Box<dyn Expression>,
    pub is_ascending: bool,
}

impl Statement for OrderByStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::OrderBy
    }
}

pub struct GroupByStatement {
    pub field_name: String,
}

impl Statement for GroupByStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::GroupBy
    }
}

pub struct AggregateFunction {
    pub function_name: String,
    pub argument: String,
}

pub struct AggregationFunctionsStatement {
    pub aggregations: HashMap<String, AggregateFunction>,
}

impl Statement for AggregationFunctionsStatement {
    fn as_any(&self) -> &dyn Any {
        self
    }

    fn get_statement_kind(&self) -> StatementKind {
        StatementKind::AggregateFunction
    }
}