Module ast 

Abstract Syntax Tree (AST) types for SQL parser

This module defines the AST node types that represent parsed SQL statements and expressions.

Structs

AliasedExpression

Aliased expression (expr AS alias)

AllAnyExpression

ALL/ANY/SOME subquery expression (e.g., x > ALL (SELECT …))

AlterTableStatement

ALTER TABLE statement

AnalyzeStatement

ANALYZE statement for collecting table statistics

AsOfClause

AS OF clause for temporal queries

BeginStatement

BEGIN statement

BetweenExpression

BETWEEN expression

BooleanLiteral

Boolean literal

CaseExpression

CASE expression

CastExpression

CAST expression

ColumnDefinition

Column definition

CommitStatement

COMMIT statement

CommonTableExpression

Common Table Expression

CreateIndexStatement

CREATE INDEX statement

CreateTableStatement

CREATE TABLE statement

CreateViewStatement

CREATE VIEW statement

CteReference

CTE reference

DefaultExpression

DEFAULT keyword expression (for INSERT VALUES)

DeleteStatement

DELETE statement

DescribeStatement

DESCRIBE statement - shows table structure

DistinctExpression

DISTINCT expression

DropIndexStatement

DROP INDEX statement

DropTableStatement

DROP TABLE statement

DropViewStatement

DROP VIEW statement

ExistsExpression

EXISTS expression

ExplainStatement

EXPLAIN statement

ExpressionList

Expression list (for IN values)

ExpressionStatement

Expression statement (standalone expression)

FloatLiteral

Float literal

ForeignKeyTableConstraint

Fields for a table-level FOREIGN KEY constraint (boxed to reduce TableConstraint enum size)

FunctionCall

Function call

FunctionTableSource

Function table source (table-valued function in FROM clause) e.g., SELECT * FROM generate_series(1, 10) AS gs(value)

GroupByClause

GROUP BY clause with optional ROLLUP/CUBE modifier

Identifier

Identifier (column name, table name, etc.)

InExpression

IN expression

InHashSetExpression

Pre-computed IN expression with HashSet for O(1) lookup

InfixExpression

Infix expression (a + b, a = b)

InsertStatement

INSERT statement

IntegerLiteral

Integer literal

IntervalLiteral

INTERVAL literal

JoinTableSource

Join table source

LikeExpression

LIKE expression with optional ESCAPE clause

ListExpression

List expression (for IN clause values)

NullLiteral

NULL literal

OrderByExpression

ORDER BY expression

Parameter

Parameter ($1, ?)

PragmaStatement

PRAGMA statement

PrefixExpression

Prefix expression (-x, NOT x)

Program

Program (collection of statements)

QualifiedIdentifier

Qualified identifier (table.column)

QualifiedStarExpression

Qualified star expression (table.*)

ReleaseSavepointStatement

RELEASE SAVEPOINT statement

RollbackStatement

ROLLBACK statement

SavepointStatement

SAVEPOINT statement

ScalarSubquery

Scalar subquery

SelectStatement

SELECT statement

SetOperation

Set operation combining two SELECT statements

SetStatement

SET statement

ShowCreateTableStatement

SHOW CREATE TABLE statement

ShowCreateViewStatement

SHOW CREATE VIEW statement

ShowIndexesStatement

SHOW INDEXES statement

ShowTablesStatement

SHOW TABLES statement

ShowViewsStatement

SHOW VIEWS statement

SimpleTableSource

Simple table source

StarExpression

Star expression (*)

StringLiteral

String literal

SubqueryTableSource

Subquery table source

TruncateStatement

TRUNCATE TABLE statement

UpdateStatement

UPDATE statement

VacuumStatement

VACUUM statement — triggers manual cleanup of deleted rows and index compaction

ValuesTableSource

VALUES table source (e.g., VALUES (1, ‘a’), (2, ‘b’) AS t(col1, col2))

WhenClause

WHEN clause in CASE expression

WindowDefinition

Named window definition (WINDOW w AS (…))

WindowExpression

Window expression

WindowFrame

Window frame specification

WithClause

WITH clause

Enums

AllAnyType

ALL/ANY comparison type

AlterTableOperation

ALTER TABLE operation type

ColumnConstraint

Column constraint

ColumnOrConstraint

Helper enum for parsing - either a column definition or a table constraint

Expression

Expression enum representing all expression types

GroupByModifier

Group by modifier (ROLLUP, CUBE, GROUPING SETS, or none)

IndexMethod

Index type for USING clause

InfixOperator

Infix operator type (pre-computed at parse time for zero-allocation evaluation) This is a key optimization: instead of string comparison for every row, we match on a small enum which is faster and allocation-free.

PrefixOperator

Prefix operator type (pre-computed at parse time)

SetOperationType

Set operation type for compound queries

Statement

Statement enum representing all statement types

TableConstraint

Table-level constraint (applied to the table rather than a single column)

WindowFrameBound

Window frame bound

WindowFrameUnit

Window frame unit

Traits

Node

Node trait - base for all AST nodes