Leave is called after children nodes have been visited. The returned node's type can be different from the input node if it is a ExprNode, Non-express

NewCIStr creates a new CIStr.

Printf prints to os.Stdout in the specified format

Get the schema.

New creates an *Error with an error code and an error message. Usually used to create base *Error.

Accept accepts Visitor to visit itself. The returned node should replace original node. ok returns false to stop visiting. Implementation of this met

NewFieldType returns a FieldType, with a type and other information about field type.

Kind gets the kind of the datum.

IsNull checks if datum is null.

SetInt64 sets int64 value.

Flag of current status, such as autocommit.

Enter is called before children nodes are visited. The returned node must be the same type as the input node n. skipChildren returns true means childr

GetArgs stands for getting all arguments.

ToNumber changes Set to float64 for numeric operation.

Fprintf formats using the format for each row and writes to writer.

GetInt64 gets int64 value.

GetUint64 gets uint64 value.

Clone copies an expression totally.

For debug

GetType gets the evaluation type of the expression.

Retrieve the child by index.

SetFloat64 sets float64 value.

ToString returns the binary string for bit type.

GetValue gets value of the expression.

Set the schema.

SetString sets string value.

SetUint64 sets uint64 value.

GetString gets string value.

NewFunction creates a new scalar function or constant.

WriteTo encode and write a row of data to the writer

currentContext gets the current resolverContext.

GetMysqlTime gets types.Time value

GetColumnIndex finds the index for a column.

Join joins two datasets by the key.

Bytes begins a flow with an [][]byte

GetName gets the aggregation function name.

Gen generates a new *Error with the same class and code, and a new formatted message.

GetFlag returns the flag of the expression.

ToFloat64 converts to a float64

inc increase the position offset of the reader. peek must be called before calling inc!

GetFloat64 gets float64 value.

Check whether this plan is correlated or not.

SetType sets evaluation type to the expression.

Get all the children.

GetMysqlDecimal gets Decimal value

SetNull sets datum to nil.

NewValueExpr creates a ValueExpr with value, and sets default field type.

SetFlag sets flag to the expression. Flag indicates whether the expression contains parameter marker, reference, aggregate function...

GetMysqlDuration gets Duration value

ToInt64 converts to a int64.

peek() peeks a rune from underlying reader. if reader meets EOF, it will return unicode.ReplacementChar. to distinguish from the real unicode.Replacem

Append append new column to the columns stored in schema.

CompareDatum compares datum to another datum. TODO: return error properly.

NewDatum creates a new Datum from an interface{}.

NewSchema returns a schema made by its parameter.

SetParents sets the children for the plan.

SetParents sets the parents for the plan.

AddChild for parent.

ExtractColumns extracts all columns from an expression.

GenByArgs generates a new *Error with the same class and code, and new arguments.

GetResultFields gets result fields.

IsZero returns a boolean indicating whether the time is equal to ZeroTime.

SetMysqlDecimal sets Decimal value

convert2PhysicalPlan converts the logical plan to the physical plan. It is called recursively from the parent to the children to create the result phy

GetMysqlBit gets Bit value

GetMysqlEnum gets Enum value

GetMysqlHex gets Hex value

GetMysqlSet gets Set value

enforceProperty creates a *physicalPlanInfo that satisfies the required property by adding sort or limit as the parent of the given physical plan.