fix: clear interrupted flag after cancel

Clear the interrupted flag after cancelling a statement when using
a direct executor.

Fixes #1879

Author: olavloite

src/main/java/com/google/cloud/spanner/jdbc/AbstractJdbcStatement.java

@@ -16,6 +16,7 @@
 
 package com.google.cloud.spanner.jdbc;
 
+import com.google.cloud.spanner.ErrorCode;
 import com.google.cloud.spanner.Options;
 import com.google.cloud.spanner.Options.QueryOption;
 import com.google.cloud.spanner.ReadContext.QueryAnalyzeMode;
@@ -259,6 +260,11 @@ private <T> T doWithStatementTimeout(
       connection.recordClientLibLatencyMetric(executionDuration.toMillis());
       return result;
     } catch (SpannerException spannerException) {
+      if (spannerException.getErrorCode() == ErrorCode.CANCELLED && this.executingLock != null) {
+        // Clear the interrupted flag of the thread.
+        //noinspection ResultOfMethodCallIgnored
+        Thread.interrupted();
+      }
       throw JdbcSqlExceptionFactory.of(spannerException);
     } finally {
       if (this.executingLock != null) {

src/test/java/com/google/cloud/spanner/jdbc/JdbcStatementTimeoutTest.java

@@ -161,7 +161,6 @@ public void testCancel() throws Exception {
                         message instanceof ExecuteSqlRequest
                             && ((ExecuteSqlRequest) message).getSql().equals(sql),
                     5000L);
-                System.out.println("Cancelling statement");
                 statement.cancel();
                 return null;
               });