zstan commented on code in PR #13116:
URL: https://github.com/apache/ignite/pull/13116#discussion_r3209268688
##########
docs/_docs/SQL/sql-calcite.adoc:
##########
@@ -483,3 +427,54 @@ Disables certain optimizer rules. This is an optimizer
level hint.
----
SELECT /*+ DISABLE_RULE('MergeJoinConverter') */ T1.* FROM TBL1 T1 JOIN TBL2
T2 ON T1.V1=T2.V1 WHERE T2.V2=?
----
+
+== Transactions [[transactions]]
+
+Transactions on `READ_COMMITTED` isolation level are supported for SQL queries
in Calcite query engine.
+To ensure backward compatibility transactions support disabled, by default.
+To enable, please, configure like the following:
+
+[tabs]
+--
+tab:XML[]
+[source,xml]
+----
+<bean class="org.apache.ignite.configuration.IgniteConfiguration">
Review Comment:
it`s just about friendy UI ... and addressd to newbie guys too
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