Do not persist data to memory by default when creating tables (dask-contrib#245)

* Add GPU tests, pytest `gpu` marker (#1)

* Add dask-cudf tests with GPU marker

* Change --gpu option to --rungpu

* xfail GPU table creation from memory

* Do not persist data to memory by default when creating tables

* Revert "Add GPU tests, pytest `gpu` marker (#1)"

This reverts commit efa492f.

* update persist doc

Co-authored-by: Charles Blackmon-Luca <20627856+charlesbluca@users.noreply.github.com>

Author: jdye64

dask_sql/context.py

@@ -123,7 +123,7 @@ def create_table(
         table_name: str,
         input_table: InputType,
         format: str = None,
-        persist: bool = True,
+        persist: bool = False,
         schema_name: str = None,
         gpu: bool = False,
         **kwargs,
@@ -144,8 +144,9 @@ def create_table(
         Typical file formats are csv or parquet.
         Any additional parameters will get passed on to the read method.
         Please note that some file formats require additional libraries.
-        By default, the data will be loaded directly into the memory
-        of the nodes. If you do not want that, set persist to False.
+        By default, the data will be lazily loaded. If you would like to
+        load the data directly into memory you can do so by setting
+        persist=True.
 
         See :ref:`data_input` for more information.
 
@@ -185,7 +186,7 @@ def create_table(
                 Specify the file format directly here if it can not be deduced from the extension.
                 If set to "memory", load the data from a published dataset in the dask cluster.
             persist (:obj:`bool`): Only used when passing a string into the ``input`` parameter.
-                Set to false to turn off loading the file data directly into memory.
+                Set to true to turn on loading the file data directly into memory.
             **kwargs: Additional arguments for specific formats. See :ref:`data_input` for more information.
 
         """