Fix CQS signal. Id] 93054880 -- readability-redundant-string-init in fbcode/velox/expression/fuzzer (facebookincubator#12997)

Summary: Pull Request resolved: facebookincubator#12997

Reviewed By: dtolnay

Differential Revision: D72781552

fbshipit-source-id: c15e1ac531c3baf4f2625dbd41c565162c16b081

Author: generatedunixname89002005287564

velox/expression/fuzzer/ExpressionFuzzer.h

@@ -78,7 +78,7 @@ class ExpressionFuzzer {
     //  pool of candidates by a required return type so not all functions may
     //  compete against the same number of functions at every instance. Number
     //  of tickets must be a positive integer. Example: eq=3,floor=5
-    std::string functionTickets = "";
+    std::string functionTickets;
 
     // Chance of adding a null constant to the plan, or null value in a vector
     // (expressed as double from 0 to 1).
@@ -87,7 +87,7 @@ class ExpressionFuzzer {
     // If specified, Fuzzer will only choose functions from this comma separated
     // list of function names (e.g: --only \"split\" or --only
     // \"substr,ltrim\")."
-    std::string useOnlyFunctions = "";
+    std::string useOnlyFunctions;
 
     // Comma-separated list of special forms to use in generated expression.
     // Supported special forms: and, or, coalesce, if, switch, cast.")

velox/expression/fuzzer/ExpressionFuzzerVerifier.h

@@ -87,7 +87,7 @@ class ExpressionFuzzerVerifier {
 
     // Directory path for persistence of data and SQL when fuzzer fails for
     // future reproduction. Empty string disables this feature.
-    std::string reproPersistPath = "";
+    std::string reproPersistPath;
 
     // Persist repro info before evaluation and only run one iteration.
     // This is to rerun with the seed number and persist repro info upon a