Export of internal ZetaSQL changes.

  - Update documentation for contributors. by Andrew Pilloud <[email protected]>
  - Remove hardcoded physical byte sizes from Value tests. by ZetaSQL Team <[email protected]>

GitOrigin-RevId: 2fd2dab16ac49d1aa5602361e65e3ae5b0d37887
Change-Id: Id7dcb133b21545d3a553040d8f6105f2c0c6be6b

Author: ZetaSQL Team

CONTRIBUTING.md

@@ -1,6 +1,20 @@
 # How to Contribute
 
-We are not currently accepting contributions to this project.
+We are not currently accepting external code contributions to this project.
+Please feel free to file bugs and feature requests using
+[GitHub's issue tracker] (https://github.com/google/zetasql/issues/new)
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted
+one (even if it was for a different project), you probably don't need to do it
+again.
 
 ## Community Guidelines
 

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,4 @@
+We are not currently accepting external code contributions to this project.
+Please feel free to file bugs and feature requests using GitHub's issue tracker.
+
+Also see: https://github.com/google/zetasql/blob/master/CONTRIBUTING.md

zetasql/public/value.h

@@ -394,6 +394,9 @@ class Value {
                                            const Type* type);
 
  private:
+  // For access to StringRef and TypedList.
+  FRIEND_TEST(ValueTest, PhysicalByteSize);
+
   template <typename H>
   H HashValueInternal(H h) const;