support clickhouse global keyword in join

src/main/java/net/sf/jsqlparser/statement/select/Join.java

@@ -21,6 +21,7 @@ public class Join extends ASTNodeAccessImpl {
     private boolean right = false;
     private boolean left = false;
     private boolean natural = false;
+    private boolean global = false;
     private boolean full = false;
     private boolean inner = false;
     private boolean simple = false;
@@ -166,6 +167,10 @@ public boolean isNatural() {
         return natural;
     }
 
+    public boolean isGlobal() {
+        return global;
+    }
+
     public Join withNatural(boolean b) {
         this.setNatural(b);
         return this;
@@ -175,6 +180,10 @@ public void setNatural(boolean b) {
         natural = b;
     }
 
+    public void setGlobal(boolean b) {
+        global = b;
+    }
+
     /**
      * Whether is a "FULL" join
      *
@@ -299,6 +308,10 @@ public void setJoinWindow(KSQLJoinWindow joinWindow) {
     public String toString() {
         StringBuilder builder = new StringBuilder();
 
+        if(isGlobal()){
+            builder.append("GLOBAL ");
+        }
+
         if (isSimple() && isOuter()) {
             builder.append("OUTER ").append(rightItem);
         } else if (isSimple()) {

src/main/java/net/sf/jsqlparser/util/deparser/SelectDeParser.java

@@ -399,6 +399,10 @@ public void visit(SubJoin subjoin) {
 
     @SuppressWarnings({"PMD.CyclomaticComplexity"})
     public void deparseJoin(Join join) {
+        if(join.isGlobal()){
+            buffer.append(" GLOBAL ");
+        }
+
         if (join.isSimple() && join.isOuter()) {
             buffer.append(", OUTER ");
         } else if (join.isSimple()) {

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -2719,6 +2719,7 @@ Join JoinerExpression() #JoinerExpression:
 
 }
 {
+    [ <K_GLOBAL> { join.setGlobal(true); } ]
     [ <K_NATURAL> { join.setNatural(true); } ]
 
     [

src/test/java/net/sf/jsqlparser/statement/select/ClickHouseTest.java

@@ -0,0 +1,23 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2019 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.statement.select;
+
+import org.junit.jupiter.api.Test;
+
+import static net.sf.jsqlparser.test.TestUtils.assertSqlCanBeParsedAndDeparsed;
+
+public class ClickHouseTest {
+
+    @Test
+    public void testGlobalJoin() throws Exception {
+        String sql = "SELECT a.*,b.* from lineorder_all as a  global left join supplier_all as b on a.LOLINENUMBER=b.SSUPPKEY";
+        assertSqlCanBeParsedAndDeparsed(sql, true);
+    }
+}