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package engine
import (
"fmt"
"math"
"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
)
// ===============================
// ARITHMETIC OPERATORS
// ===============================
// ArithmeticOperator represents basic arithmetic operations
type ArithmeticOperator string
const (
OpAdd ArithmeticOperator = "+"
OpSub ArithmeticOperator = "-"
OpMul ArithmeticOperator = "*"
OpDiv ArithmeticOperator = "/"
OpMod ArithmeticOperator = "%"
)
// EvaluateArithmeticExpression evaluates basic arithmetic operations between two values
func (e *SQLEngine) EvaluateArithmeticExpression(left, right *schema_pb.Value, operator ArithmeticOperator) (*schema_pb.Value, error) {
if left == nil || right == nil {
return nil, fmt.Errorf("arithmetic operation requires non-null operands")
}
// Convert values to numeric types for calculation
leftNum, err := e.valueToFloat64(left)
if err != nil {
return nil, fmt.Errorf("left operand conversion error: %v", err)
}
rightNum, err := e.valueToFloat64(right)
if err != nil {
return nil, fmt.Errorf("right operand conversion error: %v", err)
}
var result float64
var resultErr error
switch operator {
case OpAdd:
result = leftNum + rightNum
case OpSub:
result = leftNum - rightNum
case OpMul:
result = leftNum * rightNum
case OpDiv:
if rightNum == 0 {
return nil, fmt.Errorf("division by zero")
}
result = leftNum / rightNum
case OpMod:
if rightNum == 0 {
return nil, fmt.Errorf("modulo by zero")
}
result = math.Mod(leftNum, rightNum)
default:
return nil, fmt.Errorf("unsupported arithmetic operator: %s", operator)
}
if resultErr != nil {
return nil, resultErr
}
// Convert result back to appropriate schema value type
// If both operands were integers and operation doesn't produce decimal, return integer
if e.isIntegerValue(left) && e.isIntegerValue(right) &&
(operator == OpAdd || operator == OpSub || operator == OpMul || operator == OpMod) {
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: int64(result)},
}, nil
}
// Otherwise return as double/float
return &schema_pb.Value{
Kind: &schema_pb.Value_DoubleValue{DoubleValue: result},
}, nil
}
// Add evaluates addition (left + right)
func (e *SQLEngine) Add(left, right *schema_pb.Value) (*schema_pb.Value, error) {
return e.EvaluateArithmeticExpression(left, right, OpAdd)
}
// Subtract evaluates subtraction (left - right)
func (e *SQLEngine) Subtract(left, right *schema_pb.Value) (*schema_pb.Value, error) {
return e.EvaluateArithmeticExpression(left, right, OpSub)
}
// Multiply evaluates multiplication (left * right)
func (e *SQLEngine) Multiply(left, right *schema_pb.Value) (*schema_pb.Value, error) {
return e.EvaluateArithmeticExpression(left, right, OpMul)
}
// Divide evaluates division (left / right)
func (e *SQLEngine) Divide(left, right *schema_pb.Value) (*schema_pb.Value, error) {
return e.EvaluateArithmeticExpression(left, right, OpDiv)
}
// Modulo evaluates modulo operation (left % right)
func (e *SQLEngine) Modulo(left, right *schema_pb.Value) (*schema_pb.Value, error) {
return e.EvaluateArithmeticExpression(left, right, OpMod)
}
// ===============================
// MATHEMATICAL FUNCTIONS
// ===============================
// Round rounds a numeric value to the nearest integer or specified decimal places
func (e *SQLEngine) Round(value *schema_pb.Value, precision ...*schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("ROUND function requires non-null value")
}
num, err := e.valueToFloat64(value)
if err != nil {
return nil, fmt.Errorf("ROUND function conversion error: %v", err)
}
// Default precision is 0 (round to integer)
precisionValue := 0
if len(precision) > 0 && precision[0] != nil {
precFloat, err := e.valueToFloat64(precision[0])
if err != nil {
return nil, fmt.Errorf("ROUND precision conversion error: %v", err)
}
precisionValue = int(precFloat)
}
// Apply rounding
multiplier := math.Pow(10, float64(precisionValue))
rounded := math.Round(num*multiplier) / multiplier
// Return as integer if precision is 0 and original was integer, otherwise as double
if precisionValue == 0 && e.isIntegerValue(value) {
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: int64(rounded)},
}, nil
}
return &schema_pb.Value{
Kind: &schema_pb.Value_DoubleValue{DoubleValue: rounded},
}, nil
}
// Ceil returns the smallest integer greater than or equal to the value
func (e *SQLEngine) Ceil(value *schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("CEIL function requires non-null value")
}
num, err := e.valueToFloat64(value)
if err != nil {
return nil, fmt.Errorf("CEIL function conversion error: %v", err)
}
result := math.Ceil(num)
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: int64(result)},
}, nil
}
// Floor returns the largest integer less than or equal to the value
func (e *SQLEngine) Floor(value *schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("FLOOR function requires non-null value")
}
num, err := e.valueToFloat64(value)
if err != nil {
return nil, fmt.Errorf("FLOOR function conversion error: %v", err)
}
result := math.Floor(num)
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: int64(result)},
}, nil
}
// Abs returns the absolute value of a number
func (e *SQLEngine) Abs(value *schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("ABS function requires non-null value")
}
num, err := e.valueToFloat64(value)
if err != nil {
return nil, fmt.Errorf("ABS function conversion error: %v", err)
}
result := math.Abs(num)
// Return same type as input if possible
if e.isIntegerValue(value) {
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: int64(result)},
}, nil
}
// Check if original was float32
if _, ok := value.Kind.(*schema_pb.Value_FloatValue); ok {
return &schema_pb.Value{
Kind: &schema_pb.Value_FloatValue{FloatValue: float32(result)},
}, nil
}
// Default to double
return &schema_pb.Value{
Kind: &schema_pb.Value_DoubleValue{DoubleValue: result},
}, nil
}
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