improve sql parser trino support

core/src/main/java/com/alibaba/druid/sql/dialect/presto/visitor/PrestoOutputVisitor.java

@@ -16,9 +16,12 @@
 package com.alibaba.druid.sql.dialect.presto.visitor;
 
 import com.alibaba.druid.sql.ast.SQLLimit;
+import com.alibaba.druid.sql.ast.expr.SQLDecimalExpr;
 import com.alibaba.druid.sql.dialect.phoenix.visitor.PhoenixASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
+import java.math.BigDecimal;
+
 /**
  * presto 的输出的视图信息
  *
@@ -44,4 +47,13 @@ public class PrestoOutputVisitor extends SQLASTOutputVisitor implements PhoenixA
         x.getRowCount().accept(this);
         return false;
     }
+
+    public boolean visit(SQLDecimalExpr x) {
+        BigDecimal value = x.getValue();
+        print0(ucase ? "DECIMAL '" : "decimal '");
+        print(value.toString());
+        print('\'');
+
+        return false;
+    }
 }

core/src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -1612,6 +1612,9 @@ public class SQLExprParser extends SQLParser {
             accept(Token.RPAREN);
 
             return groupingSets;
+        } else if (lexer.token == Token.LITERAL_CHARS && expr instanceof SQLIdentifierExpr && ((SQLIdentifierExpr) expr).hashCode64() == FnvHash.Constants.DECIMAL) {
+            expr = new SQLDecimalExpr(lexer.stringVal());
+            lexer.nextToken();
         } else {
             if (lexer.token == Token.LPAREN &&
                     !(expr instanceof SQLIntegerExpr) && !(expr instanceof SQLHexExpr)) {