richardstartin commented on a change in pull request #7861:
URL: https://github.com/apache/pinot/pull/7861#discussion_r761955557
##########
File path:
pinot-common/src/main/java/org/apache/pinot/sql/parsers/CalciteSqlParser.java
##########
@@ -96,8 +96,36 @@ private CalciteSqlParser() {
private static final Pattern OPTIONS_REGEX_PATTEN =
Pattern.compile("option\\s*\\(([^\\)]+)\\)", Pattern.CASE_INSENSITIVE);
+ /**
+ * Checks for the presence of semicolon in the sql query and modifies the
query accordingly
+ *
+ * @param sql sql query
+ * @return sql query without semicolons
+ *
+ */
+ private static String checkForSemicolonInTheQuery(String sql) {
+ // Check if the query has semicolon
+ int semiColonIndex = sql.indexOf(';');
+ if (semiColonIndex > -1) {
+ // Split the input query based on semicolon
+ String[] sqlSplit = sql.split(";");
+
+ // If only semicolons are present in the input query
+ if (sqlSplit.length == 0) {
+ new SqlCompilationException("Caught exception while parsing query: " +
sql);
+ } else {
+ // After spliting take the string present at 0th index and then parse
the SQL
+ sql = sqlSplit[0];
+ }
Review comment:
My suggestion is to change the logic to allow only _terminating_
semicolons (like
[beam](https://beam.apache.org/documentation/dsls/sql/calcite/lexical-structure/#terminating-semicolons))
- so only modify the query if there is only whitespace after the semicolon or
it is the last character:
```java
int semiColonIndex = sql.indexOf(';');
boolean stripSemiColon = semiColonIndex >= 0;
for (int i = semiColonIndex + 1; i < sql.length() && stripSemiColon; i++) {
stripSemiColon = Character.isWhitespace(sql.charAt(i));
}
return stripSemiColon ? sql.substring(0, semiColonIndex) : sql;
```
This way terminating semicolons can be stripped, but rejecting semicolons
which can be ambiguous is left to the parser which has the intelligence to
discern properly.
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