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

use super::*;

impl IndexBuilder for PostgresQueryBuilder {
    // Overriden due to different "NULLS NOT UNIQUE" position in table index expression
    // (as opposed to the regular index expression)
    fn prepare_table_index_expression(
        &self,
        create: &IndexCreateStatement,
        sql: &mut dyn SqlWriter,
    ) {
        if let Some(name) = &create.index.name {
            write!(sql, "CONSTRAINT {}{}{} ", self.quote(), name, self.quote()).unwrap();
        }

        self.prepare_index_prefix(create, sql);

        if create.nulls_not_distinct {
            write!(sql, "NULLS NOT DISTINCT ").unwrap();
        }

        self.prepare_index_columns(&create.index.columns, sql);
    }

    fn prepare_index_create_statement(
        &self,
        create: &IndexCreateStatement,
        sql: &mut dyn SqlWriter,
    ) {
        write!(sql, "CREATE ").unwrap();
        self.prepare_index_prefix(create, sql);
        write!(sql, "INDEX ").unwrap();

        if create.if_not_exists {
            write!(sql, "IF NOT EXISTS ").unwrap();
        }

        if let Some(name) = &create.index.name {
            write!(sql, "{}{}{}", self.quote(), name, self.quote()).unwrap();
        }

        write!(sql, " ON ").unwrap();
        if let Some(table) = &create.table {
            self.prepare_table_ref_index_stmt(table, sql);
        }

        self.prepare_index_type(&create.index_type, sql);
        write!(sql, " ").unwrap();
        self.prepare_index_columns(&create.index.columns, sql);

        if create.nulls_not_distinct {
            write!(sql, " NULLS NOT DISTINCT").unwrap();
        }
    }

    fn prepare_table_ref_index_stmt(&self, table_ref: &TableRef, sql: &mut dyn SqlWriter) {
        match table_ref {
            TableRef::Table(_) | TableRef::SchemaTable(_, _) => {
                self.prepare_table_ref_iden(table_ref, sql)
            }
            _ => panic!("Not supported"),
        }
    }

    fn prepare_index_drop_statement(&self, drop: &IndexDropStatement, sql: &mut dyn SqlWriter) {
        write!(sql, "DROP INDEX ").unwrap();
        if let Some(table) = &drop.table {
            match table {
                TableRef::Table(_) => {}
                TableRef::SchemaTable(schema, _) => {
                    schema.prepare(sql.as_writer(), self.quote());
                    write!(sql, ".").unwrap();
                }
                _ => panic!("Not supported"),
            }
        }
        if let Some(name) = &drop.index.name {
            write!(sql, "\"{}\"", name).unwrap();
        }
    }

    fn prepare_index_type(&self, col_index_type: &Option<IndexType>, sql: &mut dyn SqlWriter) {
        if let Some(index_type) = col_index_type {
            write!(
                sql,
                " USING {}",
                match index_type {
                    IndexType::BTree => "BTREE".to_owned(),
                    IndexType::FullText => "GIN".to_owned(),
                    IndexType::Hash => "HASH".to_owned(),
                    IndexType::Custom(custom) => custom.to_string(),
                }
            )
            .unwrap();
        }
    }

    fn prepare_index_prefix(&self, create: &IndexCreateStatement, sql: &mut dyn SqlWriter) {
        if create.primary {
            write!(sql, "PRIMARY KEY ").unwrap();
        }
        if create.unique {
            write!(sql, "UNIQUE ").unwrap();
        }
    }
}