Struct ProjectionField

pub struct ProjectionField {
    pub name: String,
    pub definition: String,
    pub output_type: String,
}

Each projection field is defined by

1. a definition
2. an alias
3. an output type

by example SELECT a.title as title

• a.title is the definition
• title is the field name
• the type here is the same as the input type (most likely text)

Other example: count(c.*) as comment_count

• count(c.*) is the definition
• comment_count is the field name
• type is int as the SQL count aggregate function returns an integer.

Fields

name: String

Field name alias, this is the output name of the field.

definition: String

Field definition. Some field definitions can be fairly complex like CASE … WHEN … or using functions.

output_type: String

This indicates the SQL type of the output data.

Implementations

impl ProjectionField

pub fn new(name: &str, definition: &str, output_type: &str) -> Self

ProjectionField constructor