Make float8_tbl replicated to stabilize float8 test

As the table has just a single float8 column, XL automatically picks
ROUNDROBIN distribution. Commit 1d14325822 randomized selection of the
initial node, which with single-row inserts (used by the float8 tests)
effectively means random distribution, while before that all the rows
would be routed to the first node.

Some of the tests in float8 test suite seem to be sensitive to this, in
particular this overflow test:

    SELECT '' AS bad, f.f1 ^ '1e200' from FLOAT8_TBL f ORDER BY f1;
    ERROR:  value out of range: overflow

One of the rows (containing 1.2345678901234e-200) triggers an underflow,
so when the database hits it first, it will report this error instead:

    ERROR:  value out of range: underflow

The probability of hitting this is however fairly low (less than 10%),
as the executor has to touch the underflowing value first.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/test/regress/expected/float8.out b/src/test/regress/expected/float8.out
index 061ff87813..ce39f9b5fe 100644
--- a/src/test/regress/expected/float8.out
+++ b/src/test/regress/expected/float8.out
@@ -1,7 +1,7 @@
 --
 -- FLOAT8
 --
-CREATE TABLE FLOAT8_TBL(f1 float8);
+CREATE TABLE FLOAT8_TBL(f1 float8) DISTRIBUTE BY REPLICATION;
 INSERT INTO FLOAT8_TBL(f1) VALUES ('    0.0   ');
 INSERT INTO FLOAT8_TBL(f1) VALUES ('1004.30  ');
 INSERT INTO FLOAT8_TBL(f1) VALUES ('   -34.84');
diff --git a/src/test/regress/sql/float8.sql b/src/test/regress/sql/float8.sql
index 5d6c103afe..668653eb44 100644
--- a/src/test/regress/sql/float8.sql
+++ b/src/test/regress/sql/float8.sql
@@ -2,7 +2,7 @@
 -- FLOAT8
 --
 
-CREATE TABLE FLOAT8_TBL(f1 float8);
+CREATE TABLE FLOAT8_TBL(f1 float8) DISTRIBUTE BY REPLICATION;
 
 INSERT INTO FLOAT8_TBL(f1) VALUES ('    0.0   ');
 INSERT INTO FLOAT8_TBL(f1) VALUES ('1004.30  ');