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third_party/sqlite/src/test/e_select2.test

Index: third_party/sqlite/src/test/e_select2.test
diff --git a/third_party/sqlite/src/test/e_select2.test b/third_party/sqlite/src/test/e_select2.test
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+# 2010 September 24
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# This file implements tests to verify that the "testable statements" in 
+# the lang_select.html document are correct.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+#-------------------------------------------------------------------------
+# te_* commands:
+#
+#
+#   te_read_sql DB SELECT-STATEMENT
+#   te_read_tbl DB TABLENAME
+#
+# These two commands are used to read a dataset from the database. A dataset
+# consists of N rows of M named columns of values each, where each value has a
+# type (null, integer, real, text or blob) and a value within the types domain.
+# The tcl format for a "dataset" is a list of two elements:
+#
+#   * A list of the column names.
+#   * A list of data rows. Each row is itself a list, where each element is
+#     the contents of a column of the row. Each of these is a list of two
+#     elements, the type name and the actual value.
+#
+# For example, the contents of table [t1] as a dataset is:
+#
+#   CREATE TABLE t1(a, b);
+#   INSERT INTO t1 VALUES('abc', NULL);
+#   INSERT INTO t1 VALUES(43.1, 22);
+#
+#   {a b} {{{TEXT abc} {NULL {}}} {{REAL 43.1} {INTEGER 22}}}
+#
+# The [te_read_tbl] command returns a dataset read from a table. The
+# [te_read_sql] returns the dataset that results from executing a SELECT
+# command.
+#
+#
+#   te_tbljoin ?SWITCHES? LHS-TABLE RHS-TABLE
+#   te_join ?SWITCHES? LHS-DATASET RHS-DATASET
+#
+# This command joins the two datasets and returns the resulting dataset. If 
+# there are no switches specified, then the results is the cartesian product
+# of the two inputs.  The [te_tbljoin] command reads the left and right-hand
+# datasets from the specified tables. The [te_join] command is passed the
+# datasets directly.
+#
+# Optional switches are as follows:
+#
+#   -on SCRIPT
+#   -using COLUMN-LIST
+#   -left
+#
+# The -on option specifies a tcl script that is executed for each row in the
+# cartesian product of the two datasets. The script has 4 arguments appended
+# to it, in the following order:
+#
+#   * The list of column-names from the left-hand dataset.
+#   * A single row from the left-hand dataset (one "data row" list as 
+#     described above.
+#   * The list of column-names from the right-hand dataset.
+#   * A single row from the right-hand dataset.
+#
+# The script must return a boolean value - true if the combination of rows
+# should be included in the output dataset, or false otherwise.
+#
+# The -using option specifies a list of the columns from the right-hand
+# dataset that should be omitted from the output dataset.
+#
+# If the -left option is present, the join is done LEFT JOIN style. 
+# Specifically, an extra row is inserted if after the -on script is run there
+# exist rows in the left-hand dataset that have no corresponding rows in
+# the output. See the implementation for more specific comments.
+#
+#
+#   te_equals ?SWITCHES? COLNAME1 COLNAME2 <-on script args>
+#
+# The only supported switch is "-nocase". If it is present, then text values
+# are compared in a case-independent fashion. Otherwise, they are compared
+# as if using the SQLite BINARY collation sequence.
+#
+#
+#   te_and ONSCRIPT1 ONSCRIPT2...
+#
+#
+
+
+#
+#   te_read_tbl DB TABLENAME
+#   te_read_sql DB SELECT-STATEMENT
+#
+# These two procs are used to extract datasets from the database, either
+# by reading the contents of a named table (te_read_tbl), or by executing
+# a SELECT statement (t3_read_sql).  
+#
+# See the comment above, describing "te_* commands", for details of the
+# return values.
+#
+proc te_read_tbl {db tbl} {
+ te_read_sql $db "SELECT * FROM '$tbl'"
+}
+proc te_read_sql {db sql} {
+  set S [sqlite3_prepare_v2 $db $sql -1 DUMMY]
+
+  set cols [list]
+  for {set i 0} {$i < [sqlite3_column_count $S]} {incr i} {
+    lappend cols [sqlite3_column_name $S $i]
+  }
+
+  set rows [list]
+  while {[sqlite3_step $S] == "SQLITE_ROW"} {
+    set r [list]
+    for {set i 0} {$i < [sqlite3_column_count $S]} {incr i} {
+      lappend r [list [sqlite3_column_type $S $i] [sqlite3_column_text $S $i]]
+    }
+    lappend rows $r
+  }
+  sqlite3_finalize $S
+
+  return [list $cols $rows]
+}
+
+#-------
+# Usage:   te_join <table-data1> <table-data2> <join spec>...
+#
+# Where a join-spec is an optional list of arguments as follows:
+#
+#   ?-left?
+#   ?-using colname-list?
+#   ?-on on-expr-proc?
+#
+proc te_join {data1 data2 args} {
+
+  set testproc ""
+  set usinglist [list]
+  set isleft 0
+  for {set i 0} {$i < [llength $args]} {incr i} {
+    set a [lindex $args $i]
+    switch -- $a {
+      -on     { set testproc [lindex $args [incr i]] }
+      -using  { set usinglist [lindex $args [incr i]] }
+      -left   { set isleft 1 }
+      default {
+        error "Unknown argument: $a"
+      }
+    }
+  }
+
+  set c1 [lindex $data1 0]
+  set c2 [lindex $data2 0]
+  set omitlist [list]
+  set nullrowlist [list]
+  set cret $c1
+
+  set cidx 0
+  foreach col $c2 {
+    set idx [lsearch $usinglist $col]
+    if {$idx>=0} {lappend omitlist $cidx}
+    if {$idx<0} {
+      lappend nullrowlist {NULL {}}
+      lappend cret $col
+    }
+    incr cidx
+  }
+  set omitlist [lsort -integer -decreasing $omitlist]
+
+
+  set rret [list]
+  foreach r1 [lindex $data1 1] {
+    set one 0
+    foreach r2 [lindex $data2 1] {
+      set ok 1
+      if {$testproc != ""} {
+        set ok [eval $testproc [list $c1 $r1 $c2 $r2]]
+      }
+      if {$ok} {
+        set one 1
+        foreach idx $omitlist {set r2 [lreplace $r2 $idx $idx]}
+        lappend rret [concat $r1 $r2]
+      }
+    }
+
+    if {$isleft && $one==0} {
+      lappend rret [concat $r1 $nullrowlist]
+    }
+  }
+  
+  list $cret $rret
+}
+
+proc te_tbljoin {db t1 t2 args} {
+  te_join [te_read_tbl $db $t1] [te_read_tbl $db $t2] {*}$args
+}
+
+proc te_apply_affinity {affinity typevar valvar} {
+  upvar $typevar type
+  upvar $valvar val
+
+  switch -- $affinity {
+    integer {
+      if {[string is double $val]} { set type REAL }
+      if {[string is wideinteger $val]} { set type INTEGER }
+      if {$type == "REAL" && int($val)==$val} { 
+        set type INTEGER 
+        set val [expr {int($val)}]
+      }
+    }
+    text {
+      set type TEXT
+    }
+    none { }
+
+    default { error "invalid affinity: $affinity" }
+  }
+}
+
+#----------
+# te_equals ?SWITCHES? c1 c2 cols1 row1 cols2 row2
+#
+proc te_equals {args} {
+
+  if {[llength $args]<6} {error "invalid arguments to te_equals"}
+  foreach {c1 c2 cols1 row1 cols2 row2} [lrange $args end-5 end] break
+
+  set nocase 0
+  set affinity none
+
+  for {set i 0} {$i < ([llength $args]-6)} {incr i} {
+    set a [lindex $args $i]
+    switch -- $a {
+      -nocase {
+        set nocase 1
+      }
+      -affinity {
+        set affinity [string tolower [lindex $args [incr i]]]
+      }
+      default {
+        error "invalid arguments to te_equals"
+      }
+    }
+  }
+
+  set idx2 [if {[string is integer $c2]} { set c2 } else { lsearch $cols2 $c2 }]
+  set idx1 [if {[string is integer $c1]} { set c1 } else { lsearch $cols1 $c1 }]
+
+  set t1 [lindex $row1 $idx1 0]
+  set t2 [lindex $row2 $idx2 0]
+  set v1 [lindex $row1 $idx1 1]
+  set v2 [lindex $row2 $idx2 1]
+
+  te_apply_affinity $affinity t1 v1
+  te_apply_affinity $affinity t2 v2
+
+  if {$t1 == "NULL" || $t2 == "NULL"} { return 0 }
+  if {$nocase && $t1 == "TEXT"} { set v1 [string tolower $v1] }
+  if {$nocase && $t2 == "TEXT"} { set v2 [string tolower $v2] }
+
+
+  set res [expr {$t1 == $t2 && [string equal $v1 $v2]}]
+  return $res
+}
+
+proc te_false {args} { return 0 }
+proc te_true  {args} { return 1 }
+
+proc te_and {args} {
+  foreach a [lrange $args 0 end-4] {
+    set res [eval $a [lrange $args end-3 end]]
+    if {$res == 0} {return 0}
+  }
+  return 1
+}
+
+
+proc te_dataset_eq {testname got expected} {
+  uplevel #0 [list do_test $testname [list set {} $got] $expected]
+}
+proc te_dataset_eq_unordered {testname got expected} {
+  lset got      1 [lsort [lindex $got 1]]
+  lset expected 1 [lsort [lindex $expected 1]]
+  te_dataset_eq $testname $got $expected
+}
+
+proc te_dataset_ne {testname got unexpected} {
+  uplevel #0 [list do_test $testname [list string equal $got $unexpected] 0]
+}
+proc te_dataset_ne_unordered {testname got unexpected} {
+  lset got      1 [lsort [lindex $got 1]]
+  lset unexpected 1 [lsort [lindex $unexpected 1]]
+  te_dataset_ne $testname $got $unexpected
+}
+
+
+#-------------------------------------------------------------------------
+#
+proc test_join {tn sqljoin tbljoinargs} {
+  set sql [te_read_sql db "SELECT * FROM $sqljoin"]
+  set te  [te_tbljoin db {*}$tbljoinargs]
+  te_dataset_eq_unordered $tn $sql $te
+}
+
+drop_all_tables
+do_execsql_test e_select-2.0 {
+  CREATE TABLE t1(a, b);
+  CREATE TABLE t2(a, b);
+  CREATE TABLE t3(b COLLATE nocase);
+
+  INSERT INTO t1 VALUES(2, 'B');
+  INSERT INTO t1 VALUES(1, 'A');
+  INSERT INTO t1 VALUES(4, 'D');
+  INSERT INTO t1 VALUES(NULL, NULL);
+  INSERT INTO t1 VALUES(3, NULL);
+
+  INSERT INTO t2 VALUES(1, 'A');
+  INSERT INTO t2 VALUES(2, NULL);
+  INSERT INTO t2 VALUES(5, 'E');
+  INSERT INTO t2 VALUES(NULL, NULL);
+  INSERT INTO t2 VALUES(3, 'C');
+
+  INSERT INTO t3 VALUES('a');
+  INSERT INTO t3 VALUES('c');
+  INSERT INTO t3 VALUES('b');
+} {}
+
+foreach {tn indexes} {
+  e_select-2.1.1 { }
+  e_select-2.1.2 { CREATE INDEX i1 ON t1(a) }
+  e_select-2.1.3 { CREATE INDEX i1 ON t2(a) }
+  e_select-2.1.4 { CREATE INDEX i1 ON t3(b) }
+} {
+
+  catchsql { DROP INDEX i1 }
+  catchsql { DROP INDEX i2 }
+  catchsql { DROP INDEX i3 }
+  execsql $indexes
+
+  # EVIDENCE-OF: R-46122-14930 If the join-op is "CROSS JOIN", "INNER
+  # JOIN", "JOIN" or a comma (",") and there is no ON or USING clause,
+  # then the result of the join is simply the cartesian product of the
+  # left and right-hand datasets.
+  #
+  # EVIDENCE-OF: R-46256-57243 There is no difference between the "INNER
+  # JOIN", "JOIN" and "," join operators.
+  #
+  # EVIDENCE-OF: R-07544-24155 The "CROSS JOIN" join operator produces the
+  # same data as the "INNER JOIN", "JOIN" and "," operators
+  #
+  test_join $tn.1.1  "t1, t2"                {t1 t2}
+  test_join $tn.1.2  "t1 INNER JOIN t2"      {t1 t2}
+  test_join $tn.1.3  "t1 CROSS JOIN t2"      {t1 t2}
+  test_join $tn.1.4  "t1 JOIN t2"            {t1 t2}
+  test_join $tn.1.5  "t2, t3"                {t2 t3}
+  test_join $tn.1.6  "t2 INNER JOIN t3"      {t2 t3}
+  test_join $tn.1.7  "t2 CROSS JOIN t3"      {t2 t3}
+  test_join $tn.1.8  "t2 JOIN t3"            {t2 t3}
+  test_join $tn.1.9  "t2, t2 AS x"           {t2 t2}
+  test_join $tn.1.10 "t2 INNER JOIN t2 AS x" {t2 t2}
+  test_join $tn.1.11 "t2 CROSS JOIN t2 AS x" {t2 t2}
+  test_join $tn.1.12 "t2 JOIN t2 AS x"       {t2 t2}
+
+  # EVIDENCE-OF: R-22775-56496 If there is an ON clause specified, then
+  # the ON expression is evaluated for each row of the cartesian product
+  # as a boolean expression. All rows for which the expression evaluates
+  # to false are excluded from the dataset.
+  #
+  test_join $tn.2.1  "t1, t2 ON (t1.a=t2.a)"  {t1 t2 -on {te_equals a a}}
+  test_join $tn.2.2  "t2, t1 ON (t1.a=t2.a)"  {t2 t1 -on {te_equals a a}}
+  test_join $tn.2.3  "t2, t1 ON (1)"          {t2 t1 -on te_true}
+  test_join $tn.2.4  "t2, t1 ON (NULL)"       {t2 t1 -on te_false}
+  test_join $tn.2.5  "t2, t1 ON (1.1-1.1)"    {t2 t1 -on te_false}
+  test_join $tn.2.6  "t1, t2 ON (1.1-1.0)"    {t1 t2 -on te_true}
+
+
+  test_join $tn.3 "t1 LEFT JOIN t2 ON (t1.a=t2.a)" {t1 t2 -left -on {te_equals a a}}
+  test_join $tn.4 "t1 LEFT JOIN t2 USING (a)" {
+    t1 t2 -left -using a -on {te_equals a a}
+  }
+  test_join $tn.5 "t1 CROSS JOIN t2 USING(b, a)" {
+    t1 t2 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.6 "t1 NATURAL JOIN t2" {
+    t1 t2 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.7 "t1 NATURAL INNER JOIN t2" {
+    t1 t2 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.8 "t1 NATURAL CROSS JOIN t2" {
+    t1 t2 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.9 "t1 NATURAL INNER JOIN t2" {
+    t1 t2 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.10 "t1 NATURAL LEFT JOIN t2" {
+    t1 t2 -left -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.11 "t1 NATURAL LEFT OUTER JOIN t2" {
+    t1 t2 -left -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.12 "t2 NATURAL JOIN t1" {
+    t2 t1 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.13 "t2 NATURAL INNER JOIN t1" {
+    t2 t1 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.14 "t2 NATURAL CROSS JOIN t1" {
+    t2 t1 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.15 "t2 NATURAL INNER JOIN t1" {
+    t2 t1 -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.16 "t2 NATURAL LEFT JOIN t1" {
+    t2 t1 -left -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.17 "t2 NATURAL LEFT OUTER JOIN t1" {
+    t2 t1 -left -using {a b} -on {te_and {te_equals a a} {te_equals b b}}
+  }
+  test_join $tn.18 "t1 LEFT JOIN t2 USING (b)" {
+    t1 t2 -left -using b -on {te_equals b b}
+  }
+  test_join $tn.19 "t1 JOIN t3 USING(b)" {t1 t3 -using b -on {te_equals b b}}
+  test_join $tn.20 "t3 JOIN t1 USING(b)" {
+    t3 t1 -using b -on {te_equals -nocase b b}
+  }
+  test_join $tn.21 "t1 NATURAL JOIN t3"  {
+    t1 t3 -using b -on {te_equals b b}
+  }
+  test_join $tn.22 "t3 NATURAL JOIN t1"  {
+    t3 t1 -using b -on {te_equals -nocase b b}
+  }
+  test_join $tn.23 "t1 NATURAL LEFT JOIN t3" {
+    t1 t3 -left -using b -on {te_equals b b}
+  }
+  test_join $tn.24 "t3 NATURAL LEFT JOIN t1" {
+    t3 t1 -left -using b -on {te_equals -nocase b b}
+  }
+  test_join $tn.25 "t1 LEFT JOIN t3 ON (t3.b=t1.b)" {
+    t1 t3 -left -on {te_equals -nocase b b}
+  }
+  test_join $tn.26 "t1 LEFT JOIN t3 ON (t1.b=t3.b)" {
+    t1 t3 -left -on {te_equals b b}
+  }
+  test_join $tn.27 "t1 JOIN t3 ON (t1.b=t3.b)" { t1 t3 -on {te_equals b b} }
+
+  # EVIDENCE-OF: R-28760-53843 When more than two tables are joined
+  # together as part of a FROM clause, the join operations are processed
+  # in order from left to right. In other words, the FROM clause (A
+  # join-op-1 B join-op-2 C) is computed as ((A join-op-1 B) join-op-2 C).
+  #
+  #   Tests 28a and 28b show that the statement above is true for this case.
+  #   Test 28c shows that if the parenthesis force a different order of
+  #   evaluation the result is different. Test 28d verifies that the result
+  #   of the query with the parenthesis forcing a different order of evaluation
+  #   is as calculated by the [te_*] procs.
+  #
+  set t3_natural_left_join_t2 [
+    te_tbljoin db t3 t2 -left -using {b} -on {te_equals -nocase b b}
+  ]
+  set t1 [te_read_tbl db t1]
+  te_dataset_eq_unordered $tn.28a [
+    te_read_sql db "SELECT * FROM t3 NATURAL LEFT JOIN t2 NATURAL JOIN t1"
+  ] [te_join $t3_natural_left_join_t2 $t1                                \
+      -using {a b} -on {te_and {te_equals a a} {te_equals -nocase b b}}  \
+  ]
+
+  te_dataset_eq_unordered $tn.28b [
+    te_read_sql db "SELECT * FROM (t3 NATURAL LEFT JOIN t2) NATURAL JOIN t1"
+  ] [te_join $t3_natural_left_join_t2 $t1                                \
+      -using {a b} -on {te_and {te_equals a a} {te_equals -nocase b b}}  \
+  ]
+
+  te_dataset_ne_unordered $tn.28c [
+    te_read_sql db "SELECT * FROM (t3 NATURAL LEFT JOIN t2) NATURAL JOIN t1"
+  ] [
+    te_read_sql db "SELECT * FROM t3 NATURAL LEFT JOIN (t2 NATURAL JOIN t1)"
+  ]
+
+  set t2_natural_join_t1 [te_tbljoin db t2 t1 -using {a b}                 \
+        -using {a b} -on {te_and {te_equals a a} {te_equals -nocase b b}}  \
+  ]
+  set t3 [te_read_tbl db t3]
+  te_dataset_eq_unordered $tn.28d [
+    te_read_sql db "SELECT * FROM t3 NATURAL LEFT JOIN (t2 NATURAL JOIN t1)"
+  ] [te_join $t3 $t2_natural_join_t1                                       \
+      -left -using {b} -on {te_equals -nocase b b}                         \
+  ]
+}
+
+do_execsql_test e_select-2.2.0 {
+  CREATE TABLE t4(x TEXT COLLATE nocase);
+  CREATE TABLE t5(y INTEGER, z TEXT COLLATE binary);
+
+  INSERT INTO t4 VALUES('2.0');
+  INSERT INTO t4 VALUES('TWO');
+  INSERT INTO t5 VALUES(2, 'two');
+} {}
+
+# EVIDENCE-OF: R-55824-40976 A sub-select specified in the join-source
+# following the FROM clause in a simple SELECT statement is handled as
+# if it was a table containing the data returned by executing the
+# sub-select statement.
+#
+# EVIDENCE-OF: R-42612-06757 Each column of the sub-select dataset
+# inherits the collation sequence and affinity of the corresponding
+# expression in the sub-select statement.
+#
+foreach {tn subselect select spec} {
+  1   "SELECT * FROM t2"   "SELECT * FROM t1 JOIN %ss%" 
+      {t1 %ss%}
+
+  2   "SELECT * FROM t2"   "SELECT * FROM t1 JOIN %ss% AS x ON (t1.a=x.a)" 
+      {t1 %ss% -on {te_equals 0 0}}
+
+  3   "SELECT * FROM t2"   "SELECT * FROM %ss% AS x JOIN t1 ON (t1.a=x.a)" 
+      {%ss% t1 -on {te_equals 0 0}}
+
+  4   "SELECT * FROM t1, t2" "SELECT * FROM %ss% AS x JOIN t3"
+      {%ss% t3}
+
+  5   "SELECT * FROM t1, t2" "SELECT * FROM %ss% NATURAL JOIN t3"
+      {%ss% t3 -using b -on {te_equals 1 0}}
+
+  6   "SELECT * FROM t1, t2" "SELECT * FROM t3 NATURAL JOIN %ss%"
+      {t3 %ss% -using b -on {te_equals -nocase 0 1}}
+
+  7   "SELECT * FROM t1, t2" "SELECT * FROM t3 NATURAL LEFT JOIN %ss%"
+      {t3 %ss% -left -using b -on {te_equals -nocase 0 1}}
+
+  8   "SELECT count(*) AS y FROM t4"   "SELECT * FROM t5, %ss% USING (y)"
+      {t5 %ss% -using y -on {te_equals -affinity text 0 0}}
+
+  9   "SELECT count(*) AS y FROM t4"   "SELECT * FROM %ss%, t5 USING (y)"
+      {%ss% t5 -using y -on {te_equals -affinity text 0 0}}
+
+  10  "SELECT x AS y FROM t4"   "SELECT * FROM %ss% JOIN t5 USING (y)"
+      {%ss% t5 -using y -on {te_equals -nocase -affinity integer 0 0}}
+
+  11  "SELECT x AS y FROM t4"   "SELECT * FROM t5 JOIN %ss% USING (y)"
+      {t5 %ss% -using y -on {te_equals -nocase -affinity integer 0 0}}
+
+  12  "SELECT y AS x FROM t5"   "SELECT * FROM %ss% JOIN t4 USING (x)"
+      {%ss% t4 -using x -on {te_equals -nocase -affinity integer 0 0}}
+
+  13  "SELECT y AS x FROM t5"   "SELECT * FROM t4 JOIN %ss% USING (x)"
+      {t4 %ss% -using x -on {te_equals -nocase -affinity integer 0 0}}
+
+  14  "SELECT +y AS x FROM t5"   "SELECT * FROM %ss% JOIN t4 USING (x)"
+      {%ss% t4 -using x -on {te_equals -nocase -affinity text 0 0}}
+
+  15  "SELECT +y AS x FROM t5"   "SELECT * FROM t4 JOIN %ss% USING (x)"
+      {t4 %ss% -using x -on {te_equals -nocase -affinity text 0 0}}
+} {
+
+  # Create a temporary table named %ss% containing the data returned by
+  # the sub-select. Then have the [te_tbljoin] proc use this table to
+  # compute the expected results of the $select query. Drop the temporary
+  # table before continuing.
+  #
+  execsql "CREATE TEMP TABLE '%ss%' AS $subselect"
+  set te [eval te_tbljoin db $spec]
+  execsql "DROP TABLE '%ss%'"
+
+  # Check that the actual data returned by the $select query is the same
+  # as the expected data calculated using [te_tbljoin] above.
+  #
+  te_dataset_eq_unordered e_select-2.2.1.$tn [
+    te_read_sql db [string map [list %ss% "($subselect)"] $select]
+  ] $te
+}
+
+finish_test