Github user jinossy commented on a diff in the pull request:
https://github.com/apache/tajo/pull/947#discussion_r50515287
--- Diff: tajo-docs/src/main/sphinx/sql_language/explain.rst ---
@@ -0,0 +1,93 @@
+************************
+EXPLAIN
+************************
+
+*Synopsis*
+
+.. code-block:: sql
+
+ EXPLAIN [GLOBAL] statement
+
+
+*Description*
+
+Show the logical or distributed execution plan of a statement.
+
+
+*Examples*
+
+Logical plan:
+
+.. code-block:: sql
+
+ default> EXPLAIN SELECT l_orderkey, count(*) FROM lineitem GROUP BY
l_orderkey;
+ explain
+ -------------------------------
+ GROUP_BY(1)(l_orderkey)
+ => exprs: (count())
+ => target list: default.lineitem.l_orderkey (INT8), ?count (INT8)
+ => out schema:{(2) default.lineitem.l_orderkey (INT8), ?count (INT8)}
+ => in schema:{(1) default.lineitem.l_orderkey (INT8)}
+ SCAN(0) on default.lineitem
+ => target list: default.lineitem.l_orderkey (INT8)
+ => out schema: {(1) default.lineitem.l_orderkey (INT8)}
+ => in schema: {(16) default.lineitem.l_orderkey (INT8),
default.lineitem.l_partkey (INT8), default.lineitem.l_suppkey (INT8),
default.lineitem.l_linenumber (INT8), default.lineitem.l_quantity (FLOAT8),
default.lineitem.l_extendedprice (FLOAT8), default.lineitem.l_discount
(FLOAT8), default.lineitem.l_tax (FLOAT8), default.lineitem.l_returnflag
(TEXT), default.lineitem.l_linestatus (TEXT), default.lineitem.l_shipdate
(DATE), default.lineitem.l_commitdate (DATE), default.lineitem.l_receiptdate
(DATE), default.lineitem.l_shipinstruct (TEXT), default.lineitem.l_shipmode
(TEXT), default.lineitem.l_comment (TEXT)}
+
+
+Distributed plan:
--- End diff --
How about global plan?
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