The optimizer had problems with function tables (for example CSVREAD and FTL_SEARCH).

h2/src/docsrc/html/changelog.html

@@ -18,7 +18,10 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>The function SUM could overflow when using large values. It returns now a data type that is safe.
+<ul><li>The optimizer had problems with function tables (for example CSVREAD and FTL_SEARCH).
+	A new system property h2.estimatedFunctionTableRows (default 1000) defines how many rows
+	can be expected in the table.
+</li><li>The function SUM could overflow when using large values. It returns now a data type that is safe.
 </li><li>The function AVG could overflow when using large values. Fixed.
 </li><li>The emergency reserve file has been removed. It didn't provide an appropriate 
 	solution for the problem. It is still possible for an application to detect and deal with

h2/src/main/org/h2/constant/SysProperties.java

@@ -215,6 +215,13 @@ public class SysProperties {
      */
     public static final boolean DOLLAR_QUOTING = getBooleanSetting("h2.dollarQuoting", true);
 
+    /**
+     * System property <code>h2.estimatedFunctionTableRows</code> (default: 1000).<br />
+     * The estimated number of rows in a function table (for example, CSVREAD or FTL_SEARCH).
+     * This value is used by the optimizer.
+     */
+    public static final int ESTIMATED_FUNCTION_TABLE_ROWS = getIntSetting("h2.estimatedFunctionTableRows", 1000);
+
     /**
      * System property <code>h2.largeResultBufferSize</code> (default: 4096).<br />
      * Buffer size for large result sets. Set this value to 0 to disable the buffer.

h2/src/main/org/h2/index/FunctionIndex.java

@@ -8,6 +8,7 @@ package org.h2.index;
 
 import java.sql.SQLException;
 
+import org.h2.constant.SysProperties;
 import org.h2.engine.Session;
 import org.h2.message.Message;
 import org.h2.result.LocalResult;
@@ -53,7 +54,13 @@ public class FunctionIndex extends BaseIndex {
         if (masks != null) {
             throw Message.getUnsupportedException();
         }
-        return functionTable.getRowCount(session) * 10;
+        long expectedRows;
+        if (functionTable.canGetRowCount()) {
+            expectedRows = functionTable.getRowCount(session);
+        } else {
+            expectedRows = SysProperties.ESTIMATED_FUNCTION_TABLE_ROWS;
+        }
+        return expectedRows * 10;
     }
 
     public void remove(Session session) throws SQLException {