Pivot: Use output_table instead of out_table

JIRA: MADLIB-1376
diff --git a/src/ports/postgres/modules/utilities/pivot.py_in b/src/ports/postgres/modules/utilities/pivot.py_in
index d3d4e91..1b1a5d9 100644
--- a/src/ports/postgres/modules/utilities/pivot.py_in
+++ b/src/ports/postgres/modules/utilities/pivot.py_in
@@ -48,14 +48,14 @@
 m4_changequote(`<!', `!>')
 
 
-def pivot(schema_madlib, source_table, out_table, index, pivot_cols,
+def pivot(schema_madlib, source_table, output_table, index, pivot_cols,
           pivot_values, aggregate_func=None, fill_value=None, keep_null=False,
           output_col_dictionary=False, output_type=None, **kwargs):
     """
     Helper function that can be used to pivot tables
     Args:
         @param source_table     The original data table
-        @param out_table        The output table that contains the dummy
+        @param output_table        The output table that contains the dummy
                                 variable columns
         @param index            The index columns to group the records by
         @param pivot_cols       The columns to pivot the table
@@ -123,7 +123,7 @@
         # always build dictionary table if output is array
         output_col_dictionary = True if is_array_output else output_col_dictionary
 
-        validate_pivot_coding(source_table, out_table, indices, pcols, pvals)
+        validate_pivot_coding(source_table, output_table, indices, pcols, pvals)
 
         # Strip the end quotes for building output columns (this can only be
         # performed after the validation)
@@ -207,7 +207,7 @@
         pcol_types = plpy.execute("SELECT {0} FROM {1} LIMIT 1".
                                   format(types_str, source_table))[0]
         if output_col_dictionary:
-            out_dict = out_table + "_dictionary"
+            out_dict = output_table + "_dictionary"
             _assert(not table_exists(out_dict),
                     "Pivot: Output dictionary table already exists!")
             # Create the empty dictionary table
@@ -330,7 +330,7 @@
 
         try:
             plpy.execute("""
-                CREATE TABLE {out_table} AS
+                CREATE TABLE {output_table} AS
                     SELECT {index},
                            {all_pivot_sel_str}
                     FROM (
@@ -339,7 +339,7 @@
                             FROM {source_table}
                         ) x
                     GROUP BY {index}
-                """.format(out_table=out_table,
+                """.format(output_table=output_table,
                            index=index,
                            source_table=source_table,
                            all_pivot_from_str=', '.join(pivot_from_list),
@@ -403,18 +403,18 @@
 # ------------------------------------------------------------------------------
 
 
-def validate_pivot_coding(source_table, out_table, indices, pivs, vals):
+def validate_pivot_coding(source_table, output_table, indices, pivs, vals):
 
     """
     Args:
         @param source_table The original data table
-        @param out_table    The output table that will contain dummy columns
+        @param output_table    The output table that will contain dummy columns
         @param indices      An array of index column names
         @param cols         An array of categorical column names
     """
-    _assert(out_table and out_table.strip().lower() not in ('null', ''),
+    _assert(output_table and output_table.strip().lower() not in ('null', ''),
             "Pivot: Invalid output table name!")
-    _assert(not table_exists(out_table),
+    _assert(not table_exists(output_table),
             "Pivot: Output table already exists!")
     _assert(source_table and source_table.strip().lower() not in ('null', ''),
             "Pivot: Invalid data table name!")
@@ -491,7 +491,7 @@
 -----------------------------------------------------------------------
  SELECT {schema_madlib}.pivot(
     source_table,           -- Name of source table containing data for pivoting
-    out_table,              -- Name of output table taht contains pivoted data
+    output_table,           -- Name of output table taht contains pivoted data
     index,                  -- Comma-separated columns that will form the index
                             -- of the output pivot table
     pivot_cols,             -- Comma-separated columns that will form the
diff --git a/src/ports/postgres/modules/utilities/pivot.sql_in b/src/ports/postgres/modules/utilities/pivot.sql_in
index ab34868..dd50a34 100644
--- a/src/ports/postgres/modules/utilities/pivot.sql_in
+++ b/src/ports/postgres/modules/utilities/pivot.sql_in
@@ -699,7 +699,7 @@
  * @brief Helper function that can be used to pivot tables
  *
  * @param source_table          The original data table
- * @param out_table             The output table that contains the dummy
+ * @param output_table          The output table that contains the dummy
  *                              variable columns
  * @param index                 The index columns to group by the records by
  * @param pivot_cols            The columns to pivot the table
@@ -719,7 +719,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table            TEXT,
-    out_table               TEXT,
+    output_table            TEXT,
     index                   TEXT,
     pivot_cols              TEXT,
     pivot_values            TEXT,
@@ -736,7 +736,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table            TEXT,
-    out_table               TEXT,
+    output_table            TEXT,
     index                   TEXT,
     pivot_cols              TEXT,
     pivot_values            TEXT,
@@ -752,7 +752,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT,
@@ -767,7 +767,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT,
@@ -781,7 +781,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT,
@@ -796,7 +796,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT,
@@ -809,7 +809,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT,
@@ -822,7 +822,7 @@
 
 CREATE OR REPLACE FUNCTION MADLIB_SCHEMA.pivot(
     source_table        TEXT,
-    out_table           TEXT,
+    output_table        TEXT,
     index               TEXT,
     pivot_cols          TEXT,
     pivot_values        TEXT