sql

package
v0.0.1 Latest Latest
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 Go to latest Published: Nov 23, 2020 License: Apache-2.0 Imports: 14 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (

	// SQLParser is used to parse SQL statements
	SQLParser = participle.MustBuild(
		&Select{},
		participle.Lexer(sqlLexer),
		participle.CaseInsensitive("Keyword"),
		participle.CaseInsensitive("Timeword"),
	)
)

Functions

func FormatSQLTimestamp 

func FormatSQLTimestamp(t time.Time) string

FormatSQLTimestamp - returns the a string representation of the timestamp as used in S3 Select

func IterToValue 

func IterToValue(iter simdjson.Iter) (interface{}, error)

IterToValue converts a simdjson Iter to its underlying value. Objects are returned as simdjson.Object Arrays are returned as []interface{} with parsed values.

Types

type AliasedExpression 

type AliasedExpression struct {
	Expression *Expression `parser:"@@"`
	As         string      `parser:"[ \"AS\" @Ident ]"`
}

AliasedExpression is an expression that can be optionally named

type AndCondition 

type AndCondition struct {
	Condition []*Condition `parser:"@@ ( \"AND\" @@ )*"`
}

AndCondition represents logical conjunction of clauses

type Between 

type Between struct {
	Not   bool     `parser:" @\"NOT\"? "`
	Start *Operand `parser:" \"BETWEEN\" @@ "`
	End   *Operand `parser:" \"AND\" @@ "`
}

Between represents the RHS of a BETWEEN expression

type Boolean 

type Boolean bool

Boolean is a type for a parsed Boolean literal

func (*Boolean) Capture 

func (b *Boolean) Capture(values []string) error

Capture interface used by participle

type CastFunc 

type CastFunc struct {
	Expr     *Expression `parser:" \"CAST\" \"(\" @@ "`
	CastType string      `` /* 128-byte string literal not displayed */
}

CastFunc represents CAST sql function

type Compare 

type Compare struct {
	Operator string   `parser:"@( \"<>\" | \"<=\" | \">=\" | \"=\" | \"<\" | \">\" | \"!=\" )"`
	Operand  *Operand `parser:"  @@"`
}

Compare represents the RHS of a comparison expression

type Condition 

type Condition struct {
	Operand *ConditionOperand `parser:"  @@"`
	Not     *Condition        `parser:"| \"NOT\" @@"`
}

Condition represents a negation or a condition operand

type ConditionOperand 

type ConditionOperand struct {
	Operand      *Operand      `parser:"@@"`
	ConditionRHS *ConditionRHS `parser:"@@?"`
}

ConditionOperand is a operand followed by an an optional operation expression

type ConditionRHS 

type ConditionRHS struct {
	Compare *Compare `parser:"  @@"`
	Between *Between `parser:"| @@"`
	In      *In      `parser:"| \"IN\" @@"`
	Like    *Like    `parser:"| @@"`
}

ConditionRHS represents the right-hand-side of Compare, Between, In or Like expressions.

type CountFunc 

type CountFunc struct {
	StarArg bool        `parser:" \"COUNT\" \"(\" ( @\"*\"?"`
	ExprArg *Expression `parser:" @@? )! \")\""`
}

CountFunc represents the COUNT sql function

type DateAddFunc 

type DateAddFunc struct {
	DatePart  string       `` /* 161-byte string literal not displayed */
	Quantity  *Operand     `parser:" @@ \",\""`
	Timestamp *PrimaryTerm `parser:" @@ \")\""`
}

DateAddFunc represents the DATE_ADD function

type DateDiffFunc 

type DateDiffFunc struct {
	DatePart   string       `` /* 163-byte string literal not displayed */
	Timestamp1 *PrimaryTerm `parser:" @@ \",\" "`
	Timestamp2 *PrimaryTerm `parser:" @@ \")\" "`
}

DateDiffFunc represents the DATE_DIFF function

type Expression 

type Expression struct {
	And []*AndCondition `parser:"@@ ( \"OR\" @@ )*"`
}

Expression represents a logical disjunction of clauses

type ExtractFunc 

type ExtractFunc struct {
	Timeword string       `` /* 215-byte string literal not displayed */
	From     *PrimaryTerm `parser:" \"FROM\" @@ \")\" "`
}

ExtractFunc represents EXTRACT sql function

type FuncExpr 

type FuncExpr struct {
	SFunc     *SimpleArgFunc `parser:"  @@"`
	Count     *CountFunc     `parser:"| @@"`
	Cast      *CastFunc      `parser:"| @@"`
	Substring *SubstringFunc `parser:"| @@"`
	Extract   *ExtractFunc   `parser:"| @@"`
	Trim      *TrimFunc      `parser:"| @@"`
	DateAdd   *DateAddFunc   `parser:"| @@"`
	DateDiff  *DateDiffFunc  `parser:"| @@"`
	// contains filtered or unexported fields
}

FuncExpr represents a function call

type FuncName 

type FuncName string

FuncName - SQL function name.

type Identifier 

type Identifier struct {
	Unquoted *string           `parser:"  @Ident"`
	Quoted   *QuotedIdentifier `parser:"| @QuotIdent"`
}

Identifier represents a parsed identifier

func (*Identifier) String 

func (i *Identifier) String() string

String removes double quotes in quoted identifiers

type In 

type In struct {
	ListExpression *Expression `parser:"@@ "`
}

In represents the RHS of an IN expression

type JSONPath 

type JSONPath struct {
	BaseKey  *Identifier        `parser:" @@"`
	PathExpr []*JSONPathElement `parser:"(@@)*"`
	// contains filtered or unexported fields
}

JSONPath represents a keypath. Instances should be treated idempotent and not change once created.

func (*JSONPath) String 

func (e *JSONPath) String() string

String - returns the JSONPath representation

type JSONPathElement 

type JSONPathElement struct {
	Key            *ObjectKey `parser:"  @@"`                  // ['name'] and .name forms
	Index          *int       `parser:"| \"[\" @Number \"]\""` // [3] form
	ObjectWildcard bool       `parser:"| @\".*\""`             // .* form
	ArrayWildcard  bool       `parser:"| @\"[*]\""`            // [*] form
}

JSONPathElement represents a keypath component

func (*JSONPathElement) String 

func (e *JSONPathElement) String() string

type Like 

type Like struct {
	Not        bool     `parser:" @\"NOT\"? "`
	Pattern    *Operand `parser:" \"LIKE\" @@ "`
	EscapeChar *Operand `parser:" (\"ESCAPE\" @@)? "`
}

Like represents the RHS of a LIKE expression

type ListExpr 

type ListExpr struct {
	Elements []*Expression `parser:"\"(\" @@ ( \",\" @@ )* \")\" | \"[\" @@ ( \",\" @@ )* \"]\""`
}

ListExpr represents a literal list with elements as expressions.

type LitValue 

type LitValue struct {
	Number  *float64       `parser:"(  @Number"`
	String  *LiteralString `parser:" | @LitString"`
	Boolean *Boolean       `parser:" | @(\"TRUE\" | \"FALSE\")"`
	Null    bool           `parser:" | @\"NULL\")"`
}

LitValue represents a literal value parsed from the sql

type LiteralList 

type LiteralList []string

LiteralList is a type for parsed SQL lists literals

func (*LiteralList) Capture 

func (ls *LiteralList) Capture(values []string) error

Capture interface used by participle

type LiteralString 

type LiteralString string

LiteralString is a type for parsed SQL string literals

func (*LiteralString) Capture 

func (ls *LiteralString) Capture(values []string) error

Capture interface used by participle

type MultOp 

type MultOp struct {
	Left  *UnaryTerm     `parser:"@@"`
	Right []*OpUnaryTerm `parser:"(@@)*"`
}

MultOp represents a single term followed by an optional sequence of terms separated by *, / or % operators.

type NegatedTerm 

type NegatedTerm struct {
	Term *PrimaryTerm `parser:"\"-\" @@"`
}

NegatedTerm has a leading minus sign.

type ObjectKey 

type ObjectKey struct {
	Lit *LiteralString `parser:" \"[\" @LitString \"]\""`
	ID  *Identifier    `parser:"| \".\" @@"`
}

ObjectKey is a type for parsed strings occurring in key paths

func (*ObjectKey) String 

func (o *ObjectKey) String() string

type OpFactor 

type OpFactor struct {
	Op    string  `parser:"@(\"+\" | \"-\")"`
	Right *MultOp `parser:"@@"`
}

OpFactor represents the right-side of a +/- operation.

type OpUnaryTerm 

type OpUnaryTerm struct {
	Op    string     `parser:"@(\"*\" | \"/\" | \"%\")"`
	Right *UnaryTerm `parser:"@@"`
}

OpUnaryTerm represents the right side of *, / or % binary operations.

type Operand 

type Operand struct {
	Left  *MultOp     `parser:"@@"`
	Right []*OpFactor `parser:"(@@)*"`
}

An Operand is a single term followed by an optional sequence of terms separated by +/-

type PrimaryTerm 

type PrimaryTerm struct {
	Value         *LitValue   `parser:"  @@"`
	JPathExpr     *JSONPath   `parser:"| @@"`
	ListExpr      *ListExpr   `parser:"| @@"`
	SubExpression *Expression `parser:"| \"(\" @@ \")\""`
	// Include function expressions here.
	FuncCall *FuncExpr `parser:"| @@"`
}

PrimaryTerm represents a Value, Path expression, a Sub-expression or a function call.

type QuotedIdentifier 

type QuotedIdentifier string

QuotedIdentifier is a type for parsed strings that are double quoted.

func (*QuotedIdentifier) Capture 

func (qi *QuotedIdentifier) Capture(values []string) error

Capture interface used by participle

type Record 

type Record interface {
	Get(name string) (*Value, error)

	// Set a value.
	// Can return a different record type.
	Set(name string, value *Value) (Record, error)
	WriteCSV(writer io.Writer, opts WriteCSVOpts) error
	WriteJSON(writer io.Writer) error

	// Clone the record and if possible use the destination provided.
	Clone(dst Record) Record
	Reset()

	// Returns underlying representation
	Raw() (SelectObjectFormat, interface{})

	// Replaces the underlying data
	Replace(k interface{}) error
}

Record - is a type containing columns and their values.

type Select 

type Select struct {
	Expression *SelectExpression `parser:"\"SELECT\" @@"`
	From       *TableExpression  `parser:"\"FROM\" @@"`
	Where      *Expression       `parser:"( \"WHERE\" @@ )?"`
	Limit      *LitValue         `parser:"( \"LIMIT\" @@ )?"`
}

Select is the top level AST node type

type SelectExpression 

type SelectExpression struct {
	All         bool                 `parser:"  @\"*\""`
	Expressions []*AliasedExpression `parser:"| @@ { \",\" @@ }"`
}

SelectExpression represents the items requested in the select statement

type SelectObjectFormat 

type SelectObjectFormat int

SelectObjectFormat specifies the format of the underlying data 

const (
	// SelectFmtUnknown - unknown format (default value)
	SelectFmtUnknown SelectObjectFormat = iota
	// SelectFmtCSV - CSV format
	SelectFmtCSV
	// SelectFmtJSON - JSON format
	SelectFmtJSON
	// SelectFmtSIMDJSON - SIMD JSON format
	SelectFmtSIMDJSON
	// SelectFmtParquet - Parquet format
	SelectFmtParquet
)

type SelectStatement 

type SelectStatement struct {
	// contains filtered or unexported fields
}

SelectStatement is the top level parsed and analyzed structure

func ParseSelectStatement 

func ParseSelectStatement(s string) (stmt SelectStatement, err error)

ParseSelectStatement - parses a select query from the given string and analyzes it.

func (*SelectStatement) AggregateResult 

func (e *SelectStatement) AggregateResult(output Record) error

AggregateResult - returns the aggregated result after all input records have been processed. Applies only to aggregation queries.

func (*SelectStatement) AggregateRow 

func (e *SelectStatement) AggregateRow(input Record) error

AggregateRow - aggregates the input record. Applies only to aggregation queries.

func (*SelectStatement) Eval 

func (e *SelectStatement) Eval(input, output Record) (Record, error)

Eval - evaluates the Select statement for the given record. It applies only to non-aggregation queries. The function returns whether the statement passed the WHERE clause and should be outputted.

func (*SelectStatement) EvalFrom 

func (e *SelectStatement) EvalFrom(format string, input Record) ([]*Record, error)

EvalFrom evaluates the From clause on the input record. It only applies to JSON input data format (currently).

func (*SelectStatement) IsAggregated 

func (e *SelectStatement) IsAggregated() bool

IsAggregated returns if the statement involves SQL aggregation

func (*SelectStatement) LimitReached 

func (e *SelectStatement) LimitReached() bool

LimitReached - returns true if the number of records output has reached the value of the `LIMIT` clause.

type SimpleArgFunc 

type SimpleArgFunc struct {
	FunctionName string `` /* 193-byte string literal not displayed */

	ArgsList []*Expression `parser:"\"(\" (@@ (\",\" @@)*)?\")\""`
}

SimpleArgFunc represents functions with simple expression arguments.

type SubstringFunc 

type SubstringFunc struct {
	Expr *PrimaryTerm `parser:" \"SUBSTRING\" \"(\" @@ "`
	From *Operand     `parser:" ( \"FROM\" @@ "`
	For  *Operand     `parser:"   (\"FOR\" @@)? \")\" "`
	Arg2 *Operand     `parser:" | \",\" @@ "`
	Arg3 *Operand     `parser:"   (\",\" @@)? \")\" )"`
}

SubstringFunc represents SUBSTRING sql function

type TableExpression 

type TableExpression struct {
	Table *JSONPath `parser:"@@"`
	As    string    `parser:"( \"AS\"? @Ident )?"`
}

TableExpression represents the FROM clause

func (*TableExpression) HasKeypath 

func (from *TableExpression) HasKeypath() bool

HasKeypath returns if the from clause has a key path - e.g. S3object[*].id

type TrimFunc 

type TrimFunc struct {
	TrimWhere *string      `parser:" \"TRIM\" \"(\" ( @( \"LEADING\" | \"TRAILING\" | \"BOTH\" ) "`
	TrimChars *PrimaryTerm `parser:"             @@?  "`
	TrimFrom  *PrimaryTerm `parser:"             \"FROM\" )? @@ \")\" "`
}

TrimFunc represents TRIM sql function

type UnaryTerm 

type UnaryTerm struct {
	Negated *NegatedTerm `parser:"  @@"`
	Primary *PrimaryTerm `parser:"| @@"`
}

UnaryTerm represents a single negated term or a primary term

type Value 

type Value struct {
	// contains filtered or unexported fields
}

Value represents a value of restricted type reduced from an expression represented by an ASTNode. Only one of the fields is non-nil.

In cases where we are fetching data from a data source (like csv), the type may not be determined yet. In these cases, a byte-slice is used.

func FromArray 

func FromArray(a []Value) *Value

FromArray creates a Value from an array of values.

func FromBool 

func FromBool(b bool) *Value

FromBool creates a Value from a bool

func FromBytes 

func FromBytes(b []byte) *Value

FromBytes creates a Value from a []byte

func FromFloat 

func FromFloat(f float64) *Value

FromFloat creates a Value from a number

func FromInt 

func FromInt(f int64) *Value

FromInt creates a Value from an int

func FromNull 

func FromNull() *Value

FromNull creates a Value with Null value

func FromString 

func FromString(str string) *Value

FromString creates a Value from a string

func FromTimestamp 

func FromTimestamp(t time.Time) *Value

FromTimestamp creates a Value from a timestamp

func (Value) CSVString 

func (v Value) CSVString() string

CSVString - convert to string for CSV serialization

func (Value) Equals 

func (v Value) Equals(b Value) (ok bool)

Equals returns whether the values strictly match. Both type and value must match.

func (Value) GetTypeString 

func (v Value) GetTypeString() string

GetTypeString returns a string representation for vType

func (*Value) InferBytesType 

func (v *Value) InferBytesType() (err error)

InferBytesType will attempt to infer the data type of bytes. Will fail if value type is not bytes or it would result in invalid utf8. ORDER: int, float, bool, JSON (object or array), timestamp, string If the content is valid JSON, the type will still be bytes.

func (Value) IsArray 

func (v Value) IsArray() (ok bool)

IsArray returns whether the value is an array.

func (Value) IsNull 

func (v Value) IsNull() bool

IsNull - checks if value is missing.

func (Value) MarshalJSON 

func (v Value) MarshalJSON() ([]byte, error)

MarshalJSON provides json marshaling of values.

func (Value) Repr 

func (v Value) Repr() string

Repr returns a string representation of value.

func (Value) SameTypeAs 

func (v Value) SameTypeAs(b Value) (ok bool)

SameTypeAs return whether the two types are strictly the same.

func (Value) String 

func (v Value) String() string

func (Value) ToArray 

func (v Value) ToArray() (val []Value, ok bool)

ToArray returns the value if it is a slice of values.

func (Value) ToBool 

func (v Value) ToBool() (val bool, ok bool)

ToBool returns the bool value; second return value refers to if the bool conversion succeeded.

func (Value) ToBytes 

func (v Value) ToBytes() (val []byte, ok bool)

ToBytes returns the value if byte-slice.

func (Value) ToFloat 

func (v Value) ToFloat() (val float64, ok bool)

ToFloat works for int and float values

func (Value) ToInt 

func (v Value) ToInt() (val int64, ok bool)

ToInt returns the value if int.

func (Value) ToString 

func (v Value) ToString() (val string, ok bool)

ToString returns the value if string.

func (Value) ToTimestamp 

func (v Value) ToTimestamp() (t time.Time, ok bool)

ToTimestamp returns the timestamp value if present.

type WriteCSVOpts 

type WriteCSVOpts struct {
	FieldDelimiter rune
	Quote          rune
	QuoteEscape    rune
	AlwaysQuote    bool
}

WriteCSVOpts - encapsulates options for Select CSV output

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