add type checker

Signed-off-by: xinyual <xinyual@amazon.com>

Author: xinyual

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/ArrayFunctionImpl.java

@@ -24,6 +24,7 @@
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.apache.calcite.sql.type.SqlTypeName;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 // TODO: Support array of mixture types.
 public class ArrayFunctionImpl extends ImplementorUDF {
@@ -51,6 +52,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     };
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class ArrayImplementor implements NotNullImplementor {
     @Override
     public Expression implement(

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/ExistsFunctionImpl.java

@@ -17,6 +17,7 @@
 import org.apache.calcite.sql.type.ReturnTypes;
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 public class ExistsFunctionImpl extends ImplementorUDF {
   public ExistsFunctionImpl() {
@@ -28,6 +29,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     return ReturnTypes.BOOLEAN;
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class ExistsImplementor implements NotNullImplementor {
     @Override
     public Expression implement(

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/FilterFunctionImpl.java

@@ -18,6 +18,7 @@
 import org.apache.calcite.sql.type.ReturnTypes;
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 public class FilterFunctionImpl extends ImplementorUDF {
   public FilterFunctionImpl() {
@@ -29,6 +30,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     return ReturnTypes.ARG0;
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class FilterImplementor implements NotNullImplementor {
     @Override
     public Expression implement(

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/ForallFunctionImpl.java

@@ -17,6 +17,7 @@
 import org.apache.calcite.sql.type.ReturnTypes;
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 public class ForallFunctionImpl extends ImplementorUDF {
   public ForallFunctionImpl() {
@@ -28,6 +29,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     return ReturnTypes.BOOLEAN;
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class ForallImplementor implements NotNullImplementor {
     @Override
     public Expression implement(

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/ReduceFunctionImpl.java

@@ -28,6 +28,7 @@
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.apache.calcite.sql.type.SqlTypeName;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 public class ReduceFunctionImpl extends ImplementorUDF {
   public ReduceFunctionImpl() {
@@ -63,6 +64,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     };
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class ReduceImplementor implements NotNullImplementor {
     @Override
     public Expression implement(

core/src/main/java/org/opensearch/sql/expression/function/CollectionUDF/TransformFunctionImpl.java

@@ -26,6 +26,7 @@
 import org.apache.calcite.sql.type.SqlReturnTypeInference;
 import org.apache.calcite.sql.type.SqlTypeName;
 import org.opensearch.sql.expression.function.ImplementorUDF;
+import org.opensearch.sql.expression.function.UDFOperandMetadata;
 
 public class TransformFunctionImpl extends ImplementorUDF {
   public TransformFunctionImpl() {
@@ -44,6 +45,11 @@ public SqlReturnTypeInference getReturnTypeInference() {
     };
   }
 
+  @Override
+  public UDFOperandMetadata getOperandMetadata() {
+    return null;
+  }
+
   public static class TransformImplementor implements NotNullImplementor {
     @Override
     public Expression implement(