usage, and the cost in understanding the complexity does not need to be paid again when working with new portions of the codebase. When in doubt, waivers to rules of this type can be sought by asking your as widening a parameter type, adding a template parameter with a default value, or migrating to a new namespace. • Forward declaring symbols from namespace std:: yields undefined be- havior. • It can the global names- pace. Nonmember and static member functions may make more sense as members of a new class, especially if they access external resources or have significant dependencies. Sometimes it

order its members in some logical order, which its maintainer could explain if asked. For example, new methods are not just habitually added to the end of the class, as that would yield “chronological by followed by else or a comma. Examples: return () -> { while (condition()) { method(); } }; return new MyClass() { @Override public void method() { if (condition()) { try { something(); } catch (ProblemException try/catch/finally). Example: void doNothing() {} 4.2 Block indentation: +2 spaces Each time a new block or block-like construct is opened, the indent increases by two spaces. When the block ends, the

a alphanumeric code (C0112) and a sym- bolic name (empty-docstring). Prefer the symbolic names in new code or when updating existing code. If the reason for the suppression is not clear from the symbolic Makes it harder to deploy code because you have to replicate the package hierarchy. Decision: All new code should import each module by its full package name. Imports should be as follows: # Reference side-effects much like operator overloading. Can be confusing for subclasses. Decision: Use properties in new code to access or set data where you would normally have used simple, lightweight accessor or setter

plots, and finally, 5. recompiles the sources of the paper ... to produce a new PDF for the paper that contains the new graphs. “  Note: It takes time, plan from start  We prepared for SIGMOD 2019

xor (but not both) if (is.null(ylim)) ylim <- c(0, 0.06) Always begin the body of a block on a new line. BAD: if (is.null(ylim)) ylim <- c(0, 0.06) if (is.null(ylim)) {ylim <- c(0, 0.06)} Surround

 Plural allows to drop articles  Use guarded spaces for references that should not appear on a new line  Clear References  Make sure there are no unclear “it” or “this” references  Add descriptive

Practical. SIGMOD 2021  #14.2 Guido Moerkotte, Thomas Neumann: Analysis of Two Existing and One New Dynamic Programming Algorithm for the Generation of Optimal Bushy Join Trees without Cross Products