SQL: [Tests] Improve tests regarding integer arg

Improve tests regarding the verification of the integer arg
(non-rational number) for string functions.

(cherry picked from commit 30eba04)

Author: matriv

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/analysis/analyzer/VerifierErrorMessagesTests.java

@@ -11,6 +11,10 @@
 import org.elasticsearch.xpack.sql.analysis.index.IndexResolution;
 import org.elasticsearch.xpack.sql.analysis.index.IndexResolverTests;
 import org.elasticsearch.xpack.sql.expression.function.FunctionRegistry;
+import org.elasticsearch.xpack.sql.expression.function.scalar.math.Round;
+import org.elasticsearch.xpack.sql.expression.function.scalar.math.Truncate;
+import org.elasticsearch.xpack.sql.expression.function.scalar.string.Char;
+import org.elasticsearch.xpack.sql.expression.function.scalar.string.Space;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Coalesce;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.Greatest;
 import org.elasticsearch.xpack.sql.expression.predicate.conditional.IfNull;
@@ -23,7 +27,9 @@
 import org.elasticsearch.xpack.sql.type.EsField;
 import org.elasticsearch.xpack.sql.type.TypesTests;
 
+import java.util.Arrays;
 import java.util.LinkedHashMap;
+import java.util.Locale;
 import java.util.Map;
 
 import static java.util.Collections.emptyMap;
@@ -471,13 +477,18 @@ public void testInvalidTypeForStringFunction_WithOneArgString() {
     }
 
     public void testInvalidTypeForStringFunction_WithOneArgNumeric() {
-        assertEquals("1:8: argument of [CHAR('foo')] must be [integer], found value ['foo'] type [keyword]",
-            error("SELECT CHAR('foo')"));
+        String functionName = randomFrom(Arrays.asList(Char.class, Space.class)).getSimpleName().toUpperCase(Locale.ROOT);
+        assertEquals("1:8: argument of [" + functionName + "('foo')] must be [integer], found value ['foo'] type [keyword]",
+            error("SELECT " + functionName + "('foo')"));
+        assertEquals("1:8: argument of [" + functionName + "(1.2)] must be [integer], found value [1.2] type [double]",
+            error("SELECT " + functionName + "(1.2)"));
     }
 
     public void testInvalidTypeForNestedStringFunctions_WithOneArg() {
-        assertEquals("1:14: argument of [CHAR('foo')] must be [integer], found value ['foo'] type [keyword]",
-            error("SELECT ASCII(CHAR('foo'))"));
+        assertEquals("1:15: argument of [SPACE('foo')] must be [integer], found value ['foo'] type [keyword]",
+            error("SELECT LENGTH(SPACE('foo'))"));
+        assertEquals("1:15: argument of [SPACE(1.2)] must be [integer], found value [1.2] type [double]",
+            error("SELECT LENGTH(SPACE(1.2))"));
     }
 
     public void testInvalidTypeForNumericFunction_WithOneArg() {
@@ -498,10 +509,13 @@ public void testInvalidTypeForStringFunction_WithTwoArgs() {
     }
 
     public void testInvalidTypeForNumericFunction_WithTwoArgs() {
-        assertEquals("1:8: first argument of [TRUNCATE('foo', 2)] must be [numeric], found value ['foo'] type [keyword]",
-            error("SELECT TRUNCATE('foo', 2)"));
-        assertEquals("1:8: second argument of [TRUNCATE(1.2, 'bar')] must be [integer], found value ['bar'] type [keyword]",
-            error("SELECT TRUNCATE(1.2, 'bar')"));
+        String functionName = randomFrom(Arrays.asList(Round.class, Truncate.class)).getSimpleName().toUpperCase(Locale.ROOT);
+        assertEquals("1:8: first argument of [" + functionName + "('foo', 2)] must be [numeric], found value ['foo'] type [keyword]",
+            error("SELECT " + functionName + "('foo', 2)"));
+        assertEquals("1:8: second argument of [" + functionName + "(1.2, 'bar')] must be [integer], found value ['bar'] type [keyword]",
+            error("SELECT " + functionName + "(1.2, 'bar')"));
+        assertEquals("1:8: second argument of [" + functionName + "(1.2, 3.4)] must be [integer], found value [3.4] type [double]",
+            error("SELECT " + functionName + "(1.2, 3.4)"));
     }
 
     public void testInvalidTypeForBooleanFuntion_WithTwoArgs() {
@@ -540,9 +554,13 @@ public void testInvalidTypeForSubString() {
 
         assertEquals("1:8: second argument of [SUBSTRING('foo', 'bar', 3)] must be [integer], found value ['bar'] type [keyword]",
             error("SELECT SUBSTRING('foo', 'bar', 3)"));
+        assertEquals("1:8: second argument of [SUBSTRING('foo', 1.2, 3)] must be [integer], found value [1.2] type [double]",
+            error("SELECT SUBSTRING('foo', 1.2, 3)"));
 
         assertEquals("1:8: third argument of [SUBSTRING('foo', 2, 'bar')] must be [integer], found value ['bar'] type [keyword]",
             error("SELECT SUBSTRING('foo', 2, 'bar')"));
+        assertEquals("1:8: third argument of [SUBSTRING('foo', 2, 3.4)] must be [integer], found value [3.4] type [double]",
+            error("SELECT SUBSTRING('foo', 2, 3.4)"));
     }
 
     public void testInvalidTypeForFunction_WithFourArgs() {