add more tests to literal values type

logical-plan/src/main/kotlin/Expressions.kt

@@ -54,4 +54,29 @@ class LiteralLong(val n: Long): LogicalExpr {
     }
 }
 
-fun lit(value: Long) = LiteralLong(value)
+fun lit(value: Long) = LiteralLong(value)
+
+class LiteralFloat(val n: Float): LogicalExpr {
+    override fun toField(input: LogicalPlan): Field {
+        return Field(n.toString(), ArrowTypes.FloatType)
+    }
+
+    override fun toString(): String {
+        return n.toString()
+    }
+}
+
+fun lit(value: Float) = LiteralFloat(value)
+
+class LiteralDouble(val n: Double): LogicalExpr {
+    override fun toField(input: LogicalPlan): Field {
+        return Field(n.toString(), ArrowTypes.DoubleType)
+    }
+
+    override fun toString(): String {
+        return n.toString()
+    }
+}
+
+fun lit(value: Double) = LiteralDouble(value)
+

logical-plan/src/test/kotlin/ExpressionsTest.kt

@@ -27,4 +27,18 @@ class ExpressionsTest {
 
         assertEquals(litStr.toString(), "10000000000")
     }
+
+    @Test
+    fun `test LiteralFloat toString`() {
+        val litStr = lit(1e10.toFloat())
+
+        assertEquals(litStr.toString(), "1.0E10")
+    }
+
+    @Test
+    fun `test LiteralDouble toString`() {
+        val litStr = lit(1e10)
+
+        assertEquals(litStr.toString(), "1.0E10")
+    }
 }