Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/12991#discussion_r62437290
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -92,7 +92,7 @@ statement
| CREATE TEMPORARY? FUNCTION qualifiedName AS className=STRING
(USING resource (',' resource)*)?
#createFunction
| DROP TEMPORARY? FUNCTION (IF EXISTS)? qualifiedName
#dropFunction
- | EXPLAIN explainOption* statement
#explain
+ | EXPLAIN (LOGICAL | FORMATTED | EXTENDED | CODEGEN)? statement
#explain
--- End diff --
**Case 2: Explain with an option Extended:**
```
hive> explain extended select * from t1;
OK
ABSTRACT SYNTAX TREE:
TOK_QUERY
TOK_FROM
TOK_TABREF
TOK_TABNAME
t1
TOK_INSERT
TOK_DESTINATION
TOK_DIR
TOK_TMP_FILE
TOK_SELECT
TOK_SELEXPR
TOK_ALLCOLREF
STAGE DEPENDENCIES:
Stage-0 is a root stage
STAGE PLANS:
Stage: Stage-0
Fetch Operator
limit: -1
Processor Tree:
TableScan
alias: t1
Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL Column
stats: NONE
GatherStats: false
Select Operator
expressions: col (type: int)
outputColumnNames: _col0
Statistics: Num rows: 1 Data size: 0 Basic stats: PARTIAL
Column stats: NONE
ListSink
Time taken: 0.039 seconds, Fetched: 34 row(s)
```
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