misc: Add support for row_constructor and dereference expressions in …

…ToSqlUtil (facebookincubator#11883)

Summary:
Pull Request resolved: facebookincubator#11883

Support for row_constructor and dereference expressions were never added to ToSqlUtil.  This file is used by
Fuzzer QueryRunners (particularly Presto) to generate SQL to execute. I'm guessing these features were
never used.

This is needed as part of enabling support for custom types not supported in DWRF files in Fuzzers
comparing agains Presto.

Reviewed By: kagamiori

Differential Revision: D67310284

fbshipit-source-id: 4bf882b1cf358afa78005758fd3b0677ef7415e5

velox/exec/fuzzer/ToSQLUtil.cpp

@@ -107,6 +107,11 @@ void toCallInputsSql(
         auto concatArg =
             std::dynamic_pointer_cast<const core::ConcatTypedExpr>(input)) {
       sql << toConcatSql(concatArg);
+    } else if (
+        auto dereferenceArg =
+            std::dynamic_pointer_cast<const core::DereferenceTypedExpr>(
+                input)) {
+      sql << toDereferenceSql(dereferenceArg);
     } else {
       VELOX_NYI("Unsupported input expression: {}.", input->toString());
     }
@@ -196,6 +201,10 @@ std::string toCallSql(const core::CallTypedExprPtr& call) {
     toCallInputsSql({inputs[1]}, sql);
     sql << " and ";
     toCallInputsSql({inputs[2]}, sql);
+  } else if (call->name() == "row_constructor") {
+    sql << "row(";
+    toCallInputsSql(call->inputs(), sql);
+    sql << ")";
   } else {
     // Regular function call syntax.
     sql << call->name() << "(";
@@ -226,6 +235,13 @@ std::string toConcatSql(const core::ConcatTypedExprPtr& concat) {
   return sql.str();
 }
 
+std::string toDereferenceSql(const core::DereferenceTypedExprPtr& dereference) {
+  std::stringstream sql;
+  toCallInputsSql(dereference->inputs(), sql);
+  sql << "." << dereference->name();
+  return sql.str();
+}
+
 // Constant expressions of complex types, timestamp with timezone, interval, and
 // decimal types are not supported yet.
 std::string toConstantSql(const core::ConstantTypedExprPtr& constant) {

velox/exec/fuzzer/ToSQLUtil.h

@@ -41,6 +41,9 @@ std::string toCastSql(const core::CastTypedExprPtr& cast);
 /// Convert a concat expression into a SQL string.
 std::string toConcatSql(const core::ConcatTypedExprPtr& concat);
 
+/// Convert a dereference expression into a SQL string.
+std::string toDereferenceSql(const core::DereferenceTypedExprPtr& dereference);
+
 /// Convert a constant expression into a SQL string.
 std::string toConstantSql(const core::ConstantTypedExprPtr& constant);