zabetak commented on a change in pull request #1792: [CALCITE-3775] Implicit 
lookup methods in SimpleCalciteSchema ignore case sensitivity parameter
URL: https://github.com/apache/calcite/pull/1792#discussion_r381927103
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/jdbc/SimpleCalciteSchema.java
 ##########
 @@ -67,33 +69,72 @@ public CalciteSchema add(String name, Schema schema) {
     return calciteSchema;
   }
 
+  private String caseInsensitiveLookup(Set<String> candidates, String name) {
+    // Exact string lookup
+    if (candidates.contains(name)) {
+      return name;
+    }
+    // Upper case string lookup
+    final String upperCaseName = name.toUpperCase(Locale.ROOT);
+    if (candidates.contains(upperCaseName)) {
+      return upperCaseName;
+    }
+    // Lower case string lookup
+    final String lowerCaseName = name.toLowerCase(Locale.ROOT);
+    if (candidates.contains(lowerCaseName)) {
+      return lowerCaseName;
+    }
+    // Fall through: Set iteration
+    for (String candidate: candidates) {
+      if (candidate.equalsIgnoreCase(name)) {
+        return candidate;
+      }
+    }
+    return null;
+  }
+
   protected CalciteSchema getImplicitSubSchema(String schemaName,
       boolean caseSensitive) {
     // Check implicit schemas.
-    Schema s = schema.getSubSchema(schemaName);
-    if (s != null) {
-      return new SimpleCalciteSchema(this, s, schemaName);
+    final String schemaName2 = caseSensitive ? schemaName : 
caseInsensitiveLookup(
+        schema.getSubSchemaNames(), schemaName);
+    if (schemaName2 == null) {
+      return null;
     }
-    return null;
+    final Schema s = schema.getSubSchema(schemaName2);
+    if (s == null) {
+      return null;
+    }
+    return new SimpleCalciteSchema(this, s, schemaName2);
   }
 
   protected TableEntry getImplicitTable(String tableName,
       boolean caseSensitive) {
     // Check implicit tables.
-    Table table = schema.getTable(tableName);
-    if (table != null) {
-      return tableEntry(tableName, table);
+    final String tableName2 = caseSensitive ? tableName : 
caseInsensitiveLookup(
+        schema.getTableNames(), tableName);
+    if (tableName2 == null) {
 
 Review comment:
   I see two options:
   1. We provide a way to do case-insensitive lookups without affecting the 
performance of the case-sensitive case (so exactly what this PR tries to do);
   2. We forbid case-insensitive lookups by throwing an 
`IllegalArgumentException` when the flag is `true`. 
   Leaving as it is now right now is confusing and might cause subtle bugs that 
may not reveal themselves from the beginning. I am OK with any of those two 
options.

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