Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/18387#discussion_r123509528
--- Diff:
sql/core/src/test/resources/sql-tests/results/tablesample-negative.sql.out ---
@@ -0,0 +1,62 @@
+-- Automatically generated by SQLQueryTestSuite
+-- Number of queries: 6
+
+
+-- !query 0
+CREATE DATABASE mydb1
+-- !query 0 schema
+struct<>
+-- !query 0 output
+
+
+
+-- !query 1
+USE mydb1
+-- !query 1 schema
+struct<>
+-- !query 1 output
+
+
+
+-- !query 2
+CREATE TABLE t1 USING parquet AS SELECT 1 AS i1
+-- !query 2 schema
+struct<>
+-- !query 2 output
+
+
+
+-- !query 3
+SELECT mydb1.t1 FROM t1 TABLESAMPLE (-1 PERCENT)
+-- !query 3 schema
+struct<>
+-- !query 3 output
+org.apache.spark.sql.catalyst.parser.ParseException
+
+mismatched input 'FROM' expecting {<EOF>, 'WHERE', 'GROUP', 'ORDER',
'HAVING', 'LIMIT', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS',
'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE'}(line 1, pos 16)
--- End diff --
Yeah changing this in SqlBase.g4 seems to make sense.
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