ss-dm-ts.tex

\subsection{Data model and type system}
\label{subsec:dm-ts}
Calcite's data model consists of three main entities.

\begin{itemize}
  \item \textbf{Schema} - A schema groups tables, streams, views and materialisations into one logical entity. A schema adapter~\ref{subsec:adapters} can be used to expose particular kind of data (e.g. Cassandra keyspace) as tables within a schema to Calcite.
  \item \textbf{Table} - A table is a typed collection of records defined by a set of named, strongly typed columns. Records in a table have no defined ordering.
  \item \textbf{Stream} - A stream is a possibly indefinite sequence of temporally-defined typed records. Each record in a stream should contain at least one monotonic or quasi-monotonic column that defines the order of records temporarily.
\end{itemize}

\MP{Please feel free to edit above. I am still not sure what we should mention about type system.}