clarify constant values

Author: lidavidm

c/include/arrow-adbc/adbc.h

@@ -577,46 +577,62 @@ const struct AdbcError* AdbcErrorFromArrayStream(struct ArrowArrayStream* stream
 /// \brief This foreign key does not allow update of the corresponding primary
 ///   key.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyNoAction`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_ACTION_NO_ACTION 3
 
 /// \brief This foreign key will be updated/deleted with corresponding primary
 ///   key.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyCascade`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_ACTION_CASCADE 0
 
 /// \brief This foreign key will be set to NULL if its corresponding primary
 ///   key is updated or deleted.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeySetNull`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_ACTION_SET_NULL 2
 
 /// \brief This foreign key will be set to its default if its corresponding
 ///   primary key is updated or deleted.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeySetDefault`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_ACTION_SET_DEFAULT 4
 
 /// \brief Similar to ADBC_CONSTRAINT_ACTION_NO_ACTION but may be interpreted
 ///   differently by the vendor (e.g., raise an error immediately instead of
 ///   allowing the check to be deferred).
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyRestrict`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_ACTION_RESTRICT 1
 
 /// \brief This constraint is deferrable, and is initially deferred.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyInitiallyDeferred`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_DEFERRABLE_DEFERRED 5
 
 /// \brief This constraint is deferrable, but is initially immediate.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyInitiallyImmediate`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_DEFERRABLE_IMMEDIATE 6
 
 /// \brief This constraint may not be deferred.
 ///
+/// \note Value corresponds to JDBC `DatabaseMetaData#importedKeyNotDeferrable`.
+///
 /// \see AdbcConnectionGetObjects
 #define ADBC_CONSTRAINT_NOT_DEFERRABLE 7