ast

package
v2.0.0-alpha.11 Latest Latest
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 Go to latest Published: Aug 20, 2024 License: Apache-2.0 Imports: 7 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	DefaultStream = StreamName("$$default")
	AliasStream   = StreamName("$$alias")
)
View Source 
const (
	StreamKindLookup = "lookup"
	StreamKindScan   = "scan"
)
View Source 
const (
	RowkindInsert = "insert"
	RowkindUpdate = "update"
	RowkindUpsert = "upsert"
	RowkindDelete = "delete"
)
View Source 
const (
	SELECT_LIT = "SELECT"
	CREATE     = "CREATE"
	DROP       = "DROP"
	EXPLAIN    = "EXPLAIN"
	DESCRIBE   = "DESCRIBE"
	SHOW       = "SHOW"
	STREAM     = "STREAM"
	TABLE      = "TABLE"
	STREAMS    = "STREAMS"
	TABLES     = "TABLES"
	WITH       = "WITH"

	DATASOURCE        = "DATASOURCE"
	KEY               = "KEY"
	FORMAT            = "FORMAT"
	CONF_KEY          = "CONF_KEY"
	TYPE              = "TYPE"
	STRICT_VALIDATION = "STRICT_VALIDATION"
	TIMESTAMP         = "TIMESTAMP"
	TIMESTAMP_FORMAT  = "TIMESTAMP_FORMAT"
	RETAIN_SIZE       = "RETAIN_SIZE"
	SHARED            = "SHARED"
	SCHEMAID          = "SCHEMAID"
	KIND              = "KIND"
	DELIMITER         = "DELIMITER"

	XBIGINT   = "BIGINT"
	XFLOAT    = "FLOAT"
	XSTRING   = "STRING"
	XBYTEA    = "BYTEA"
	XDATETIME = "DATETIME"
	XBOOLEAN  = "BOOLEAN"
	XARRAY    = "ARRAY"
	XSTRUCT   = "STRUCT"
)

Variables

View Source 
var COLUMN_SEPARATOR = Tokens[COLSEP]
View Source 
var StreamDataTypes = map[string]DataType{
	XBIGINT:   BIGINT,
	XFLOAT:    FLOAT,
	XSTRING:   STRINGS,
	XBYTEA:    BYTEA,
	XDATETIME: DATETIME,
	XBOOLEAN:  BOOLEAN,
	XARRAY:    ARRAY,
	XSTRUCT:   STRUCT,
}
View Source 
var StreamTokens = map[string]struct{}{
	DATASOURCE:        {},
	KEY:               {},
	FORMAT:            {},
	CONF_KEY:          {},
	TYPE:              {},
	STRICT_VALIDATION: {},
	TIMESTAMP:         {},
	TIMESTAMP_FORMAT:  {},
	RETAIN_SIZE:       {},
	SHARED:            {},
	SCHEMAID:          {},
	KIND:              {},
	DELIMITER:         {},
}
View Source 
var StreamTypeMap = map[StreamType]string{
	TypeStream: "stream",
	TypeTable:  "table",
}
View Source 
var Tokens = []string{
	ILLEGAL:     "ILLEGAL",
	EOF:         "EOF",
	AS:          "AS",
	WS:          "WS",
	IDENT:       "IDENT",
	INTEGER:     "INTEGER",
	NUMBER:      "NUMBER",
	STRING:      "STRING",
	SINGLEQUOTE: "SINGLEQUOTE",

	ADD:         "+",
	SUB:         "-",
	MUL:         "*",
	DIV:         "/",
	MOD:         "%",
	BITWISE_AND: "&",
	BITWISE_OR:  "|",
	BITWISE_XOR: "^",

	EQ:  "=",
	NEQ: "!=",
	LT:  "<",
	LTE: "<=",
	GT:  ">",
	GTE: ">=",

	SUBSET: "[]",
	ARROW:  "->",
	IN:     "IN",

	ASTERISK: "*",
	COMMA:    ",",

	LPAREN:    "(",
	RPAREN:    ")",
	LBRACKET:  "[",
	RBRACKET:  "]",
	HASH:      "#",
	DOT:       ".",
	SEMICOLON: ";",
	COLON:     ":",
	COLSEP:    "\007",

	SELECT:    "SELECT",
	FROM:      "FROM",
	JOIN:      "JOIN",
	LEFT:      "LEFT",
	INNER:     "INNER",
	ON:        "ON",
	WHERE:     "WHERE",
	LIMIT:     "LIMIT",
	GROUP:     "GROUP",
	ORDER:     "ORDER",
	HAVING:    "HAVING",
	BY:        "BY",
	ASC:       "ASC",
	DESC:      "DESC",
	FILTER:    "FILTER",
	CASE:      "CASE",
	WHEN:      "WHEN",
	THEN:      "THEN",
	ELSE:      "ELSE",
	END:       "END",
	OVER:      "OVER",
	PARTITION: "PARTITION",

	AND:        "AND",
	OR:         "OR",
	TRUE:       "TRUE",
	FALSE:      "FALSE",
	NOTIN:      "NOT IN",
	BETWEEN:    "BETWEEN",
	NOTBETWEEN: "NOT BETWEEN",
	LIKE:       "LIKE",
	NOTLIKE:    "NOT LIKE",
	REPLACE:    "REPLACE",
	EXCEPT:     "EXCEPT",

	DD: "DD",
	HH: "HH",
	MI: "MI",
	SS: "SS",
	MS: "MS",
}

Functions

func IsBooleanArg 

func IsBooleanArg(arg Expr) bool

func IsFieldRefArg 

func IsFieldRefArg(arg Expr) bool

func IsFloatArg 

func IsFloatArg(arg Expr) bool

func IsIntegerArg 

func IsIntegerArg(arg Expr) bool

func IsNumericArg 

func IsNumericArg(arg Expr) bool

func IsStreamOptionKeyword 

func IsStreamOptionKeyword(_ Token, lit string) bool

func IsStringArg 

func IsStringArg(arg Expr) bool

func IsTimeArg 

func IsTimeArg(arg Expr) bool

func Walk 

func Walk(v Visitor, node Node)

func WalkFunc 

func WalkFunc(node Node, fn func(Node) bool)

WalkFunc traverses a node hierarchy in depth-first order.

Types

type AliasRef 

type AliasRef struct {
	// MUST have, It is used for evaluation
	Expression Expr

	// optional, lazy set when calculating isAggregate
	IsAggregate *bool
	// contains filtered or unexported fields
}

func MockAliasRef 

func MockAliasRef(e Expr, r []StreamName, a *bool) *AliasRef

MockAliasRef is for testing only.

func NewAliasRef 

func NewAliasRef(e Expr) (*AliasRef, error)

func (*AliasRef) SetRefSource 

func (a *AliasRef) SetRefSource(names []string)

SetRefSource only used for unit test

type ArrayType 

type ArrayType struct {
	Type DataType
	FieldType
}

type ArrowExpr 

type ArrowExpr struct {
	Expr Expr
}

func (*ArrowExpr) String 

func (ae *ArrowExpr) String() string

type BasicType 

type BasicType struct {
	Type DataType
	FieldType
}

type BetweenExpr 

type BetweenExpr struct {
	Lower  Expr
	Higher Expr
}

func (*BetweenExpr) String 

func (b *BetweenExpr) String() string

type BinaryExpr 

type BinaryExpr struct {
	OP  Token
	LHS Expr
	RHS Expr
}

func (*BinaryExpr) String 

func (be *BinaryExpr) String() string

func (*BinaryExpr) ValidateExpr 

func (be *BinaryExpr) ValidateExpr() error

type BooleanLiteral 

type BooleanLiteral struct {
	Val bool
}

func (*BooleanLiteral) String 

func (bl *BooleanLiteral) String() string

type BracketExpr 

type BracketExpr struct {
	Expr Expr
}

func (*BracketExpr) String 

func (be *BracketExpr) String() string

type Call 

type Call struct {
	Name     string
	FuncId   int
	FuncType FuncType
	Args     []Expr
	// This is used for analytic functions.
	// In planner, all analytic functions are planned to calculate in analytic_op which produce a new field.
	// This cachedField cached the new field name and when evaluating, just returned the field access evaluated value.
	CachedField string
	Cached      bool
	Partition   *PartitionExpr
	WhenExpr    Expr

	// This is used for window functions.
	SortFields SortFields
}

func (*Call) String 

func (c *Call) String() string

type CaseExpr 

type CaseExpr struct {
	// The compare value Expression. It can be a value Expression or nil.
	// When it is nil, the WhenClause Expr must be a logical(comparison) Expression
	Value       Expr
	WhenClauses []*WhenClause
	ElseClause  Expr
}

func (*CaseExpr) String 

func (c *CaseExpr) String() string

type ColFuncField 

type ColFuncField struct {
	Name string
	Expr Expr
}

func (*ColFuncField) String 

func (fr *ColFuncField) String() string

type ColonExpr 

type ColonExpr struct {
	Start Expr
	End   Expr
}

func (*ColonExpr) String 

func (be *ColonExpr) String() string

func (*ColonExpr) ValidateExpr 

func (c *ColonExpr) ValidateExpr() error

type DataType 

type DataType int
const (
	UNKNOWN DataType = iota
	BIGINT
	FLOAT
	STRINGS
	BYTEA
	DATETIME
	BOOLEAN
	ARRAY
	STRUCT
)

func GetDataType 

func GetDataType(lit string) DataType

func (DataType) IsSimpleType 

func (d DataType) IsSimpleType() bool

func (DataType) String 

func (d DataType) String() string

type DescribeStreamStatement 

type DescribeStreamStatement struct {
	Name string

	Statement
}

func (*DescribeStreamStatement) GetName 

func (dss *DescribeStreamStatement) GetName() string

type DescribeTableStatement 

type DescribeTableStatement struct {
	Name string

	Statement
}

func (*DescribeTableStatement) GetName 

func (dss *DescribeTableStatement) GetName() string

type Dimension 

type Dimension struct {
	Expr Expr

	Node
}

type Dimensions 

type Dimensions []Dimension

func (*Dimensions) GetGroups 

func (d *Dimensions) GetGroups() Dimensions

func (*Dimensions) GetWindow 

func (d *Dimensions) GetWindow() *Window

type DropStreamStatement 

type DropStreamStatement struct {
	Name string

	Statement
}

func (*DropStreamStatement) GetName 

func (dss *DropStreamStatement) GetName() string

type DropTableStatement 

type DropTableStatement struct {
	Name string

	Statement
}

func (*DropTableStatement) GetName 

func (dss *DropTableStatement) GetName() string

type ExplainStreamStatement 

type ExplainStreamStatement struct {
	Name string

	Statement
}

func (*ExplainStreamStatement) GetName 

func (ess *ExplainStreamStatement) GetName() string

type ExplainTableStatement 

type ExplainTableStatement struct {
	Name string

	Statement
}

func (*ExplainTableStatement) GetName 

func (ess *ExplainTableStatement) GetName() string

type Expr 

type Expr interface {
	Node

	// String function for the explain grammar, convert Expr to String
	String() string
	// contains filtered or unexported methods
}

type Field 

type Field struct {
	Name  string
	AName string
	Expr  Expr

	Node
}

func (*Field) GetName 

func (f *Field) GetName() string

func (*Field) IsColumn 

func (f *Field) IsColumn() bool

func (*Field) IsSelectionField 

func (f *Field) IsSelectionField() bool

type FieldRef 

type FieldRef struct {
	// optional, bind in analyzer, empty means alias, default means not set
	// MUST have after binding for SQL fields. For 1.2,1.3 and 1.4, use special constant as stream name
	StreamName StreamName
	// optional, set only once. For selections, empty name will be assigned a default name
	// MUST have after binding, assign a name for 1.4
	Name string
	// Only for alias
	*AliasRef
}

FieldRef could be

  1. SQL Field 1.1 Explicit field "stream.col" 1.2 Implicit field "col" -> only exist in schemaless stream. Otherwise, explicit stream name will be bound 1.3 Alias field "expr as c" -> refer to an Expression or column

func (*FieldRef) IsAlias 

func (fr *FieldRef) IsAlias() bool

func (*FieldRef) IsColumn 

func (fr *FieldRef) IsColumn() bool

func (*FieldRef) RefSelection 

func (fr *FieldRef) RefSelection(a *AliasRef)

func (*FieldRef) RefSources 

func (fr *FieldRef) RefSources() []StreamName

RefSources Must call after binding or will get empty

func (*FieldRef) SetRefSource 

func (fr *FieldRef) SetRefSource(names []StreamName)

SetRefSource Only call this for alias field ref

func (*FieldRef) String 

func (fr *FieldRef) String() string

type FieldType 

type FieldType interface {
	// contains filtered or unexported methods
}

type Fields 

type Fields []Field

func (Fields) Len 

func (f Fields) Len() int

func (Fields) Less 

func (f Fields) Less(i int, j int) bool

func (Fields) Swap 

func (f Fields) Swap(i, j int)

type FuncType 

type FuncType int
const (
	FuncTypeUnknown FuncType = iota - 1
	FuncTypeScalar
	FuncTypeAgg
	FuncTypeCols
	FuncTypeSrf
	FuncTypeWindow
	FuncTypeTrigger
)

type IndexExpr 

type IndexExpr struct {
	Index Expr
}

func (*IndexExpr) String 

func (be *IndexExpr) String() string

type IntegerLiteral 

type IntegerLiteral struct {
	Val int64
}

func (*IntegerLiteral) String 

func (il *IntegerLiteral) String() string

type Join 

type Join struct {
	Name     string
	Alias    string
	JoinType JoinType
	Expr     Expr

	Node
}

type JoinType 

type JoinType int
const (
	LEFT_JOIN JoinType = iota
	INNER_JOIN
	RIGHT_JOIN
	FULL_JOIN
	CROSS_JOIN
)

func (JoinType) String 

func (j JoinType) String() string

type Joins 

type Joins []Join

type JsonFieldRef 

type JsonFieldRef struct {
	Name string
}

func (*JsonFieldRef) String 

func (fr *JsonFieldRef) String() string

type JsonStreamField 

type JsonStreamField struct {
	Type       string                      `json:"type"`
	Items      *JsonStreamField            `json:"items,omitempty"`
	Properties map[string]*JsonStreamField `json:"properties,omitempty"`

	Selected bool
}

type LikePattern 

type LikePattern struct {
	Expr    Expr
	Pattern *regexp.Regexp
}

func (*LikePattern) Compile 

func (l *LikePattern) Compile(likestr string) (*regexp.Regexp, error)

func (*LikePattern) String 

func (l *LikePattern) String() string

type LimitExpr 

type LimitExpr struct {
	LimitCount *IntegerLiteral
}

func (*LimitExpr) String 

func (l *LimitExpr) String() string

type Literal 

type Literal interface {
	Expr
	// contains filtered or unexported methods
}

type MetaRef 

type MetaRef struct {
	StreamName StreamName
	Name       string
}

func (*MetaRef) String 

func (fr *MetaRef) String() string

type NameNode 

type NameNode interface {
	Node
	GetName() string
}

type Node 

type Node interface {
	// contains filtered or unexported methods
}

type NumberLiteral 

type NumberLiteral struct {
	Val float64
}

func (*NumberLiteral) String 

func (nl *NumberLiteral) String() string

type Options 

type Options struct {
	DATASOURCE        string `json:"datasource,omitempty"`
	KEY               string `json:"key,omitempty"`
	FORMAT            string `json:"format,omitempty"`
	CONF_KEY          string `json:"confKey,omitempty"`
	TYPE              string `json:"type,omitempty"`
	STRICT_VALIDATION bool   `json:"strictValidation,omitempty"`
	TIMESTAMP         string `json:"timestamp,omitempty"`
	TIMESTAMP_FORMAT  string `json:"timestampFormat,omitempty"`
	SHARED            bool   `json:"shared,omitempty"`
	SCHEMAID          string `json:"schemaid,omitempty"`
	// for scan table only
	RETAIN_SIZE int `json:"retainSize,omitempty"`
	// for table only, to distinguish lookup & scan
	KIND string `json:"kind,omitempty"`
	// for delimited format only
	DELIMITER string `json:"delimiter,omitempty"`

	RuleID       string                      `json:"-"`
	Schema       map[string]*JsonStreamField `json:"-"`
	IsWildCard   bool                        `json:"-"`
	IsSchemaLess bool                        `json:"-"`
	StreamName   string                      `json:"-"`
}

Options The stream AST tree

type ParenExpr 

type ParenExpr struct {
	Expr Expr
}

func (*ParenExpr) String 

func (pe *ParenExpr) String() string

type PartitionExpr 

type PartitionExpr struct {
	Exprs []Expr
}

func (*PartitionExpr) String 

func (pe *PartitionExpr) String() string

type RecType 

type RecType struct {
	StreamFields StreamFields
	FieldType
}

type SelectStatement 

type SelectStatement struct {
	Fields     Fields
	Sources    Sources
	Joins      Joins
	Condition  Expr
	Limit      Expr
	Dimensions Dimensions
	Having     Expr
	SortFields SortFields

	Statement
}

type ShowStreamsStatement 

type ShowStreamsStatement struct {
	Statement
}

type ShowTablesStatement 

type ShowTablesStatement struct {
	Statement
}

type SortField 

type SortField struct {
	Name       string
	StreamName StreamName
	Uname      string // unique name of a field
	Ascending  bool
	FieldExpr  Expr

	Expr
}

func (*SortField) String 

func (sf *SortField) String() string

type SortFields 

type SortFields []SortField

type Source 

type Source interface {
	Node
	// contains filtered or unexported methods
}

type Sources 

type Sources []Source

type Statement 

type Statement interface {
	Node
	// contains filtered or unexported methods
}

type StreamField 

type StreamField struct {
	Name string
	FieldType
}

func (*StreamField) MarshalJSON 

func (u *StreamField) MarshalJSON() ([]byte, error)

type StreamFields 

type StreamFields []StreamField

func (*StreamFields) ToJsonSchema 

func (sf *StreamFields) ToJsonSchema() map[string]*JsonStreamField

func (*StreamFields) UnmarshalFromMap 

func (sf *StreamFields) UnmarshalFromMap(data map[string]*JsonStreamField) error

func (*StreamFields) UnmarshalJSON 

func (sf *StreamFields) UnmarshalJSON(data []byte) error

UnmarshalJSON The json format follows json schema

type StreamName 

type StreamName string

type StreamStmt 

type StreamStmt struct {
	Name         StreamName
	StreamFields StreamFields
	Options      *Options
	StreamType   StreamType // default to TypeStream

	Statement
}

type StreamType 

type StreamType int
const (
	TypeStream StreamType = iota
	TypeTable
)

type StringLiteral 

type StringLiteral struct {
	Val string
}

func (*StringLiteral) String 

func (sl *StringLiteral) String() string

type Table 

type Table struct {
	Name  string
	Alias string
	Source
}

type TimeLiteral 

type TimeLiteral struct {
	Val Token
}

func (*TimeLiteral) String 

func (tl *TimeLiteral) String() string

type Token 

type Token int
const (
	// Special Tokens
	ILLEGAL Token = iota
	EOF
	WS
	COMMENT

	AS
	// Literals
	IDENT // main

	INTEGER     // 12345
	NUMBER      // 12345.67
	STRING      // "abc"
	SINGLEQUOTE // 'abc'
	BADSTRING   // "abc

	// ADD and the following
	ADD         // +
	SUB         // -
	MUL         // *
	DIV         // /
	MOD         // %
	BITWISE_AND // &
	BITWISE_OR  // |
	BITWISE_XOR // ^

	AND // AND
	OR  // OR

	EQ  // =
	NEQ // !=
	LT  // <
	LTE // <=
	GT  // >
	GTE // >=

	SUBSET //[
	ARROW  //->
	IN     // IN
	NOT    // NOT
	NOTIN  // NOT
	BETWEEN
	NOTBETWEEN
	LIKE
	NOTLIKE
	REPLACE
	EXCEPT

	// Misc characters
	ASTERISK  // *
	COMMA     // ,
	LPAREN    // (
	RPAREN    // )
	LBRACKET  //[
	RBRACKET  //]
	HASH      // #
	DOT       // .
	COLON     //:
	SEMICOLON //;
	COLSEP    //\007

	// Keywords
	SELECT
	FROM
	JOIN
	INNER
	LEFT
	RIGHT
	FULL
	CROSS
	ON
	WHERE
	LIMIT
	GROUP
	ORDER
	HAVING
	BY
	ASC
	DESC
	FILTER
	CASE
	WHEN
	THEN
	ELSE
	END
	OVER
	PARTITION

	TRUE
	FALSE

	DD
	HH
	MI
	SS
	MS
)

func (Token) AllowedSFNToken 

func (tok Token) AllowedSFNToken() bool

Allowed special field name token

func (Token) AllowedSourceToken 

func (tok Token) AllowedSourceToken() bool

func (Token) IsOperator 

func (tok Token) IsOperator() bool

func (Token) IsTimeLiteral 

func (tok Token) IsTimeLiteral() bool

func (Token) Precedence 

func (tok Token) Precedence() int

func (Token) String 

func (tok Token) String() string

type ValidateAbleExpr 

type ValidateAbleExpr interface {
	ValidateExpr() error
}

type ValueSetExpr 

type ValueSetExpr struct {
	LiteralExprs []Expr // ("A", "B", "C") or (1, 2, 3)
	ArrayExpr    Expr
}

func (*ValueSetExpr) String 

func (c *ValueSetExpr) String() string

type Visitor 

type Visitor interface {
	Visit(Node) bool
}

type WhenClause 

type WhenClause struct {
	// The condition Expression
	Expr   Expr
	Result Expr
}

func (*WhenClause) String 

func (w *WhenClause) String() string

type Wildcard 

type Wildcard struct {
	Token   Token
	Replace []Field
	Except  []string
}

func (*Wildcard) String 

func (w *Wildcard) String() string

type Window 

type Window struct {
	TriggerCondition Expr
	WindowType       WindowType
	Delay            *IntegerLiteral
	Length           *IntegerLiteral
	Interval         *IntegerLiteral
	TimeUnit         *TimeLiteral
	Filter           Expr
	Expr
}

func (*Window) String 

func (wd *Window) String() string

type WindowType 

type WindowType int
const (
	NOT_WINDOW WindowType = iota
	TUMBLING_WINDOW
	HOPPING_WINDOW
	SLIDING_WINDOW
	SESSION_WINDOW
	COUNT_WINDOW
)

func (WindowType) String 

func (w WindowType) String() string

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