Function buildJoinTableExpressionTree

server/ast/update.go:98–114

buildJoinTableExpressionTree returns an expression tree of JoinTableExprs with |tableExprs| as the leaf nodes. If |tableExprs| is empty or nil, then nil is returned.

(ctx *Context, tableExprs vitess.TableExprs)

// buildJoinTableExpressionTree returns an expression tree of JoinTableExprs with |tableExprs| as the
// leaf nodes. If |tableExprs| is empty or nil, then nil is returned.
func buildJoinTableExpressionTree(ctx *Context, tableExprs vitess.TableExprs) vitess.TableExpr {
	switch len(tableExprs) {
	case 0:
		return nil
	case 1:
		return tableExprs[0]
	case 2:
		return &vitess.JoinTableExpr{
			Join:      vitess.JoinStr,
			LeftExpr:  tableExprs[0],
			RightExpr: tableExprs[1],
		}
	default:
		subtree := buildJoinTableExpressionTree(ctx, tableExprs[0:2])
		return buildJoinTableExpressionTree(ctx, append(tableExprs[2:], subtree))
	}
}