IGNITE-22041 Correct inline size calculation for indexes (#3622)

diff --git a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtils.java b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtils.java
index e6eb2f5..515c107 100644
--- a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtils.java
+++ b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtils.java
@@ -83,6 +83,8 @@
                 return Math.min(MAX_VARLEN_INLINE_SIZE, ((VarlenNativeType) nativeType).length());
 
             case DECIMAL:
+                return Short.BYTES + BIG_NUMBER_INLINE_SIZE;
+
             case NUMBER:
                 return BIG_NUMBER_INLINE_SIZE;
 
diff --git a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/hash/io/HashIndexTreeIo.java b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/hash/io/HashIndexTreeIo.java
index a6fe0ff..afba7d7 100644
--- a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/hash/io/HashIndexTreeIo.java
+++ b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/hash/io/HashIndexTreeIo.java
@@ -64,7 +64,7 @@
 public interface HashIndexTreeIo {
     /** Item size without index columns in bytes. */
     int ITEM_SIZE_WITHOUT_COLUMNS = Integer.BYTES // Index columns hash.
-            + Short.SIZE // Inlined index columns size.
+            + Short.BYTES // Inlined index columns size.
             + PARTITIONLESS_LINK_SIZE_BYTES // Index columns link.
             + 2 * Long.BYTES; // Row ID.
 
diff --git a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/sorted/io/SortedIndexTreeIo.java b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/sorted/io/SortedIndexTreeIo.java
index 89bcbd9..f677d8a 100644
--- a/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/sorted/io/SortedIndexTreeIo.java
+++ b/modules/storage-page-memory/src/main/java/org/apache/ignite/internal/storage/pagememory/index/sorted/io/SortedIndexTreeIo.java
@@ -56,7 +56,7 @@
  */
 public interface SortedIndexTreeIo {
     /** Item size without index columns in bytes. */
-    int ITEM_SIZE_WITHOUT_COLUMNS = Short.SIZE // Inlined index columns size.
+    int ITEM_SIZE_WITHOUT_COLUMNS = Short.BYTES // Inlined index columns size.
             + PARTITIONLESS_LINK_SIZE_BYTES // Index columns link.
             + 2 * Long.BYTES; // Row ID.
 
diff --git a/modules/storage-page-memory/src/test/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtilsTest.java b/modules/storage-page-memory/src/test/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtilsTest.java
index ee92155..08060da 100644
--- a/modules/storage-page-memory/src/test/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtilsTest.java
+++ b/modules/storage-page-memory/src/test/java/org/apache/ignite/internal/storage/pagememory/index/InlineUtilsTest.java
@@ -99,10 +99,10 @@
 
         // Variable length type checking.
 
-        assertEquals(BIG_NUMBER_INLINE_SIZE, inlineSize(nativeType = NativeTypes.decimalOf(1, 1)));
+        assertEquals(2 + BIG_NUMBER_INLINE_SIZE, inlineSize(nativeType = NativeTypes.decimalOf(1, 1)));
         nativeTypeSpecs.remove(nativeType.spec());
 
-        assertEquals(BIG_NUMBER_INLINE_SIZE, inlineSize(nativeType = NativeTypes.decimalOf(100, 1)));
+        assertEquals(2 + BIG_NUMBER_INLINE_SIZE, inlineSize(nativeType = NativeTypes.decimalOf(100, 1)));
         nativeTypeSpecs.remove(nativeType.spec());
 
         assertEquals(7, inlineSize(nativeType = NativeTypes.stringOf(7)));