support oracle alter table truncate partition

src/main/java/net/sf/jsqlparser/statement/alter/AlterExpression.java

@@ -68,6 +68,8 @@ public class AlterExpression implements Serializable {
 
     private boolean useBrackets = false;
 
+    private String truncatePartitionName = null;
+
     public Index getOldIndex() {
         return oldIndex;
     }
@@ -402,6 +404,19 @@ public void setUk(boolean uk) {
         this.uk = uk;
     }
 
+    public String getTruncatePartitionName() {
+        return truncatePartitionName;
+    }
+
+    public void setTruncatePartitionName(String truncatePartitionName) {
+        this.truncatePartitionName = truncatePartitionName;
+    }
+
+    public AlterExpression withTruncatePartitionName(String truncatePartitionName) {
+        this.truncatePartitionName = truncatePartitionName;
+        return this;
+    }
+
     @Override
     @SuppressWarnings({"PMD.CyclomaticComplexity", "PMD.NPathComplexity",
             "PMD.ExcessiveMethodLength", "PMD.SwitchStmtsShouldHaveDefault"})
@@ -441,6 +456,9 @@ public String toString() {
                 && !pkColumns.isEmpty()) {
             // Oracle Multi Column Drop
             b.append("DROP (").append(PlainSelect.getStringList(pkColumns)).append(')');
+        } else if (operation == AlterOperation.TRUNCATE_PARTITION
+                && truncatePartitionName != null) {
+            b.append("TRUNCATE PARTITION ").append(truncatePartitionName);
         } else {
             if (operation == AlterOperation.COMMENT_WITH_EQUAL_SIGN) {
                 b.append("COMMENT =").append(" ");

src/main/java/net/sf/jsqlparser/statement/alter/AlterOperation.java

@@ -10,7 +10,7 @@
 package net.sf.jsqlparser.statement.alter;
 
 public enum AlterOperation {
-    ADD, ALTER, DROP, DROP_PRIMARY_KEY, DROP_UNIQUE, DROP_FOREIGN_KEY, MODIFY, CHANGE, ALGORITHM, RENAME, RENAME_TABLE, RENAME_INDEX, RENAME_KEY, RENAME_CONSTRAINT, COMMENT, COMMENT_WITH_EQUAL_SIGN, UNSPECIFIC;
+    ADD, ALTER, DROP, DROP_PRIMARY_KEY, DROP_UNIQUE, DROP_FOREIGN_KEY, MODIFY, CHANGE, ALGORITHM, RENAME, RENAME_TABLE, RENAME_INDEX, RENAME_KEY, RENAME_CONSTRAINT, COMMENT, COMMENT_WITH_EQUAL_SIGN, UNSPECIFIC, TRUNCATE_PARTITION;
 
     public static AlterOperation from(String operation) {
         return Enum.valueOf(AlterOperation.class, operation.toUpperCase());

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

@@ -6252,6 +6252,7 @@ AlterExpression AlterExpression():
     AlterExpression.ColumnDropNotNull alterExpressionColumnDropNotNull = null;
     AlterExpression.ColumnDropDefault alterExpressionColumnDropDefault = null;
     ReferentialAction.Action action = null;
+    String truncatePartitionName = null;
 
     // for captureRest()
     List<String> tokens = new LinkedList<String>();
@@ -6543,6 +6544,8 @@ AlterExpression AlterExpression():
            } 
           )
       |
+      LOOKAHEAD(2) <K_TRUNCATE> <K_PARTITION> { alterExp.setOperation(AlterOperation.TRUNCATE_PARTITION); } truncatePartitionName = RelObjectName() { alterExp.setTruncatePartitionName(truncatePartitionName); }
+      |
       tokens = captureRest() {
                     alterExp.setOperation(AlterOperation.UNSPECIFIC);
                     StringBuilder optionalSpecifier = new StringBuilder();

src/test/java/net/sf/jsqlparser/statement/alter/AlterTest.java

@@ -981,4 +981,11 @@ public void testAlterColumnSetCommitTimestamp1() throws JSQLParserException {
         assertEquals("UPDATE_DATE_TIME_GMT SET OPTIONS (allow_commit_timestamp=true)",
                 type.toString());
     }
+
+    @Test
+    public void testIssue1890() throws JSQLParserException {
+        String stmt =
+                "ALTER TABLE xdmiddle.ft_mid_sop_sms_send_list_daily TRUNCATE PARTITION sum_date";
+        assertSqlCanBeParsedAndDeparsed(stmt);
+    }
 }