Module ast 

Abstract syntax tree of the supported SQL dialect.

parse produces these types. They describe the statement exactly as written: names are not checked against a schema and literals are not converted to column types yet. The grammar they model is documented in the SQL reference of the wasm-dbms book.

Structs

Aggregate

An aggregate function call such as COUNT(*) or SUM(price).

Assignment

One column = value entry of an UPDATE ... SET list.

ColumnRef

A column name, optionally qualified: column or table.column.

Delete

A DELETE FROM table WHERE condition [CASCADE | RESTRICT] statement.

Insert

An INSERT INTO table (columns) VALUES (values) statement.

JoinClause

A JOIN table ON left = right clause.

OrderItem

One ORDER BY entry: operand [ASC | DESC].

Select

A SELECT statement.

SelectItem

One entry of an explicit select list: operand [AS alias].

TableRef

A table in FROM or JOIN: name [[AS] alias].

Update

An UPDATE table SET assignments WHERE condition statement.

Enums

AggregateKind

The supported aggregate functions.

CompareOp

A comparison operator.

Condition

A boolean condition of a WHERE or HAVING clause.

JoinKind

The supported join types.

Literal

A literal value, before conversion to a column type.

Operand

Something that yields a value per row or per group.

Projection

The select list of a Select.

RowCount

The argument of LIMIT or OFFSET.

Statement

A parsed SQL statement.

ValueExpr

A value written in the statement: a literal or a ? placeholder.