Example #1
0
func getPKValues(conditions []sqlparser.BoolExpr, pkIndex *schema.Index) (pkValues []interface{}, err error) {
	pkIndexScore := NewIndexScore(pkIndex)
	pkValues = make([]interface{}, len(pkIndexScore.ColumnMatch))
	for _, condition := range conditions {
		condition, ok := condition.(*sqlparser.ComparisonExpr)
		if !ok {
			return nil, nil
		}
		if !sqlparser.StringIn(condition.Operator, sqlparser.AST_EQ, sqlparser.AST_IN) {
			return nil, nil
		}
		index := pkIndexScore.FindMatch(string(condition.Left.(*sqlparser.ColName).Name))
		if index == -1 {
			return nil, nil
		}
		switch condition.Operator {
		case sqlparser.AST_EQ, sqlparser.AST_IN:
			var err error
			pkValues[index], err = sqlparser.AsInterface(condition.Right)
			if err != nil {
				return nil, err
			}
		default:
			panic("unreachable")
		}
	}
	if pkIndexScore.GetScore() == PERFECT_SCORE {
		return pkValues, nil
	}
	return nil, nil
}
Example #2
0
func isIndexChanging(setClauses sqlparser.UpdateExprs, colVindexes []*ColVindex) bool {
	vindexCols := make([]string, len(colVindexes))
	for i, index := range colVindexes {
		vindexCols[i] = index.Col
	}
	for _, assignment := range setClauses {
		if sqlparser.StringIn(string(assignment.Name.Name), vindexCols...) {
			return true
		}
	}
	return false
}
Example #3
0
func analyzeBoolean(node sqlparser.BoolExpr) (conditions []sqlparser.BoolExpr) {
	switch node := node.(type) {
	case *sqlparser.AndExpr:
		left := analyzeBoolean(node.Left)
		right := analyzeBoolean(node.Right)
		if left == nil || right == nil {
			return nil
		}
		if sqlparser.HasINClause(left) && sqlparser.HasINClause(right) {
			return nil
		}
		return append(left, right...)
	case *sqlparser.ParenBoolExpr:
		return analyzeBoolean(node.Expr)
	case *sqlparser.ComparisonExpr:
		switch {
		case sqlparser.StringIn(
			node.Operator,
			sqlparser.AST_EQ,
			sqlparser.AST_LT,
			sqlparser.AST_GT,
			sqlparser.AST_LE,
			sqlparser.AST_GE,
			sqlparser.AST_NSE,
			sqlparser.AST_LIKE):
			if sqlparser.IsColName(node.Left) && sqlparser.IsValue(node.Right) {
				return []sqlparser.BoolExpr{node}
			}
		case node.Operator == sqlparser.AST_IN:
			if sqlparser.IsColName(node.Left) && sqlparser.IsSimpleTuple(node.Right) {
				return []sqlparser.BoolExpr{node}
			}
		}
	case *sqlparser.RangeCond:
		if node.Operator != sqlparser.AST_BETWEEN {
			return nil
		}
		if sqlparser.IsColName(node.Left) && sqlparser.IsValue(node.From) && sqlparser.IsValue(node.To) {
			return []sqlparser.BoolExpr{node}
		}
	}
	return nil
}